{"id":406730,"date":"2026-04-16T14:00:00","date_gmt":"2026-04-16T04:00:00","guid":{"rendered":"https:\/\/science.nasa.gov\/earth\/earth-observatory\/eyeing-the-richat-structure\/"},"modified":"2026-04-16T14:00:00","modified_gmt":"2026-04-16T04:00:00","slug":"eyeing-the-richat-structure","status":"publish","type":"post","link":"https:\/\/www.vibewire.com.au\/?p=406730","title":{"rendered":"Eyeing the Richat Structure"},"content":{"rendered":"<div id=\"\" class=\" hds-module hds-module-full alignfull wp-block-nasa-blocks-secondary-navigation\">\n<div class=\"hds-secondary-navigation-wrapper z-top width-100 padding-0\">\n<div id=\"\" class=\"hds-secondary-navigation width-full border-bottom-1px text-center hds-color-mode-dark hds-module hds-module-full alignfull wp-block-nasa-blocks-hdsnav\"><button type=\"button\" class=\"hds-secondary-nav-mobile-button display-flex tablet:display-flex desktop:display-none width-full flex-align-center bg-carbon-90 border-color-carbon-80 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href=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/eyeing-the-richat-structure\/richatstructure_oli_20260306.jpg?w=1440&#038;h=960&#038;%23038;fit=clip&#038;%23038;crop=faces%2Cfocalpoint\" rel=\"noopener\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1440\" height=\"960\" src=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/eyeing-the-richat-structure\/richatstructure_oli_20260306.jpg?w=1440&#038;h=960&#038;%23038;fit=clip&#038;%23038;crop=faces%2Cfocalpoint\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"A large \"bull's-eye\" feature composed of concentric rock formations of various colors is imprinted on the edge of a dark plateau flanked by desert sands.\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" loading=\"eager\" srcset=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/eyeing-the-richat-structure\/richatstructure_oli_20260306.jpg?w=1440&#038;h=960&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1440w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/eyeing-the-richat-structure\/richatstructure_oli_20260306.jpg?w=300&#038;h=200&#038;fit=crop&#038;crop=faces%2Cfocalpoint 300w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/eyeing-the-richat-structure\/richatstructure_oli_20260306.jpg?w=768&#038;h=512&#038;fit=crop&#038;crop=faces%2Cfocalpoint 768w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/eyeing-the-richat-structure\/richatstructure_oli_20260306.jpg?w=1024&#038;h=683&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1024w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/eyeing-the-richat-structure\/richatstructure_oli_20260306.jpg?w=400&#038;h=267&#038;fit=crop&#038;crop=faces%2Cfocalpoint 400w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/eyeing-the-richat-structure\/richatstructure_oli_20260306.jpg?w=600&#038;h=400&#038;fit=crop&#038;crop=faces%2Cfocalpoint 600w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/eyeing-the-richat-structure\/richatstructure_oli_20260306.jpg?w=900&#038;h=600&#038;fit=crop&#038;crop=faces%2Cfocalpoint 900w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/eyeing-the-richat-structure\/richatstructure_oli_20260306.jpg?w=1200&#038;h=800&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1200w\" sizes=\"auto, (max-width: 1440px) 100vw, 1440px\" \/><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\">\n<div class=\"hds-caption-text p-sm margin-0\">The Richat Structure appears as a giant \u201cbull\u2019s eye\u201d on a plateau in Mauritania in this mosaic, composed of images captured by the <a href=\"https:\/\/science.nasa.gov\/mission\/landsat\/oli\/\" rel=\"noopener\">OLI<\/a> (Operational Land Imager) on <a href=\"https:\/\/science.nasa.gov\/mission\/landsat-9\/\" rel=\"noopener\">Landsat 9<\/a> and <a href=\"https:\/\/science.nasa.gov\/mission\/landsat-8\/\" rel=\"noopener\">Landsat 8<\/a> on March 5 and March 6, 2026, respectively.<\/div>\n<div class=\"hds-credits\">NASA Earth Observatory\/Lauren Dauphin<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\n<p>In a remote part of northern Mauritania on the Adrar Plateau lies a desert landscape rich in human history. This region of northwestern Africa is sprinkled with Paleolithic stone tools, Neolithic cave paintings, and the remains of <a href=\"https:\/\/whc.unesco.org\/en\/urban-heritage-atlas\/ancient-ksour\/\" rel=\"noopener\">medieval towns<\/a> once used by caravans crossing the Sahara Desert.<\/p>\n<p>When viewed from space, the landscape appears to be shaped most prominently by natural forces. Wind sculpted the seas of colorful sand dunes and scoured plateaus capped with dark <a href=\"https:\/\/www.britannica.com\/science\/desert-pavement\" rel=\"noopener\">desert pavement<\/a>, while ancient flowing water carved valleys and networks of dried river channels.<\/p>\n<p>But the region\u2019s most eye-catching feature when seen from above is the Richat Structure\u2014a large geologic formation made of concentric ridges on the eastern side of the plateau. French geographers first described the feature in the 1930s, calling it the Richat \u201cbuttonhole.\u201d NASA astronauts Ed White and James McDivitt helped bring wider global attention to what became known as <a href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/the-eye-of-sahara-150060\/\" rel=\"noopener\">\u201cThe Eye of the Sahara\u201d<\/a> after <a href=\"https:\/\/catalog.archives.gov\/id\/5804919\" rel=\"noopener\">photographing<\/a> it during their history-making <a href=\"https:\/\/www.nasa.gov\/centers-and-facilities\/kennedy\/gemini-iv-learning-to-walk-in-space-2\/\" rel=\"noopener\">Gemini IV mission<\/a>.<\/p>\n<p>The 40-kilometer-wide (25-mile-wide) structure was initially thought to be an <a href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/fresh-craters-on-the-moon-and-earth-39769\/\" rel=\"noopener\">impact crater<\/a> because large meteors can produce circular features on Earth\u2019s surface. However, <a href=\"https:\/\/doi.org\/10.1130\/G21542.1\" rel=\"noopener\">researchers<\/a> later <a href=\"https:\/\/doi.org\/10.1007\/s12517-021-08734-4\" rel=\"noopener\">showed<\/a> that it is actually a deeply eroded <a href=\"https:\/\/www.britannica.com\/science\/dome-geology\" rel=\"noopener\">geologic dome<\/a> formed by the uplift of rock above an <a href=\"https:\/\/www.geologyin.com\/2018\/03\/types-of-intrusive-igneous-rock.html\" rel=\"noopener\">underground intrusion<\/a> of igneous material. Over time, differing <a href=\"https:\/\/education.nationalgeographic.org\/resource\/erosion\/\" rel=\"noopener\">erosion rates<\/a> among rock types in the exposed upper dome led to the development of circular ridges known as <a href=\"https:\/\/www.britannica.com\/science\/cuesta\" rel=\"noopener\">cuestas<\/a>. The orange and gray colors reflect differences in sedimentary and igneous rock types across the structure and the surrounding landscape.<\/p>\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<p><em>NASA Earth Observatory image by Lauren Dauphin, using Landsat data from the\u00a0<a href=\"http:\/\/earthexplorer.usgs.gov\/\" rel=\"noopener\">U.S. Geological Survey<\/a>. Story by Adam Voiland.<\/em><\/p>\n<div id=\"\" class=\"hds-featured-file-list bg-spacesuit-white padding-x-2 tablet:padding-x-3 desktop:padding-x-4 padding-y-5 desktop:padding-y-6 hds-module align wp-block-nasa-blocks-file-list\">\n<div class=\"grid-container grid-container-block padding-0\">\n<div class=\"grid-row width-full margin-bottom-4\">\n<div class=\"grid-col-12 desktop:grid-col-6 margin-bottom-2 desktop:margin-bottom-0\">\n<h2 role=\"textbox\" class=\"heading-22\">\n\t\t\t\t\tDownloads\t\t\t\t<\/h2>\n<\/p>\n<\/div>\n<div class=\"grid-col-12 desktop:grid-col-6\">\n<div class=\"desktop:grid-col display-flex flex-align-center desktop:flex-justify-end\">\n\t\t\t\t\t\t\t\t\t<\/div>\n<\/p>\n<\/div>\n<\/div>\n<div class=\"hds-list-row hds-file-list-row\">\n<div class=\"hds-list-thumbnail hds-file-list-thumbnail\">\n<div class=\"hds-list-thumbnail-inner hds-file-list-thumbnail-inner hds-cover-wrapper\">\n<figure class=\"hds-media-background  \"><img decoding=\"async\" width=\"4022\" height=\"2681\" src=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/eyeing-the-richat-structure\/richatstructure_oli_20260306_lrg.jpg?w=4022&#038;h=2681&#038;%23038;fit=clip&#038;%23038;crop=faces%2Cfocalpoint\" class=\"attachment-thumbnail size-thumbnail\" alt=\"A large \"bull's-eye\" feature composed of concentric rock formations of various colors is imprinted on the edge of a dark plateau flanked by desert sands.\" style=\"transform: scale(1.2); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" loading=\"lazy\" data-video-loop=\"\" srcset=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/eyeing-the-richat-structure\/richatstructure_oli_20260306_lrg.jpg?w=4022&#038;h=2681&#038;fit=crop&#038;crop=faces%2Cfocalpoint 4022w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/eyeing-the-richat-structure\/richatstructure_oli_20260306_lrg.jpg?w=300&#038;h=200&#038;fit=crop&#038;crop=faces%2Cfocalpoint 300w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/eyeing-the-richat-structure\/richatstructure_oli_20260306_lrg.jpg?w=768&#038;h=512&#038;fit=crop&#038;crop=faces%2Cfocalpoint 768w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/eyeing-the-richat-structure\/richatstructure_oli_20260306_lrg.jpg?w=1024&#038;h=683&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1024w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/eyeing-the-richat-structure\/richatstructure_oli_20260306_lrg.jpg?w=1536&#038;h=1024&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1536w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/eyeing-the-richat-structure\/richatstructure_oli_20260306_lrg.jpg?w=2048&#038;h=1365&#038;fit=crop&#038;crop=faces%2Cfocalpoint 2048w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/eyeing-the-richat-structure\/richatstructure_oli_20260306_lrg.jpg?w=400&#038;h=267&#038;fit=crop&#038;crop=faces%2Cfocalpoint 400w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/eyeing-the-richat-structure\/richatstructure_oli_20260306_lrg.jpg?w=600&#038;h=400&#038;fit=crop&#038;crop=faces%2Cfocalpoint 600w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/eyeing-the-richat-structure\/richatstructure_oli_20260306_lrg.jpg?w=900&#038;h=600&#038;fit=crop&#038;crop=faces%2Cfocalpoint 900w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/eyeing-the-richat-structure\/richatstructure_oli_20260306_lrg.jpg?w=1200&#038;h=800&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1200w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/eyeing-the-richat-structure\/richatstructure_oli_20260306_lrg.jpg?w=2000&#038;h=1333&#038;fit=crop&#038;crop=faces%2Cfocalpoint 2000w\" sizes=\"auto, (max-width: 4022px) 100vw, 4022px\" \/><\/figure>\n<\/div>\n<\/div>\n<div class=\"hds-list-details\">\n<div class=\"hds-list-name hds-file-list-name\">\n<h2 class=\"heading-22\">March 5 and March 6, 2026<\/h2>\n<\/p>\n<\/div>\n<div class=\"hds-list-meta\">\n<div class=\"hds-list-meta-item hds-list-date hds-file-list-date\">\n<p class=\"p-sm\">\n<\/div>\n<div class=\"hds-list-meta-item hds-file-list-filetype\">\n<p class=\"p-sm\">JPEG (9.03 MB)<\/p>\n<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"hds-list-cta hds-file-list-download\">\n\t\t\t\t\t<a href=\"https:\/\/assets.science.nasa.gov\/content\/dam\/science\/esd\/eo\/images\/iotd\/2026\/eyeing-the-richat-structure\/richatstructure_oli_20260306_lrg.jpg\"  download rel=\"noopener\"><br \/>\n\t\t\t\t\t\t<svg width=\"32\" height=\"32\" viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle cx=\"16\" cy=\"16.0001\" r=\"16\" fill=\"#1C67E3\"\/><path d=\"M15.2357 8.00007L15.2357 16.4829L11.9504 13.4078L10.8801 14.4094L16.0001 19.2001L21.1201 14.4094L20.0499 13.4078L16.7645 16.4829L16.7645 8.00007L15.2357 8.00007Z\" fill=\"white\"\/><path fill-rule=\"evenodd\" clip-rule=\"evenodd\" d=\"M9.6 20.8001V18.4001H8V22.4001H24V18.4001H22.4V20.8001H9.6Z\" fill=\"white\"\/><\/svg><br \/>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n<\/p>\n<\/div>\n<\/div>\n<\/div>\n<h2 class=\"wp-block-heading\">References &#038; Resources<\/h2>\n<ul class=\"wp-block-list\">\n<li>Abdeina, E.H., et al. (2024) <a href=\"https:\/\/doi.org\/10.1016\/j.lithos.2024.107698\" rel=\"noopener\">How old is the Eye of Africa? A polyphase history for the igneous Richat Structure, Mauritania<\/a>. <em>Lithos<\/em>, 107698.<\/li>\n<li>Abdeina, E.H., et al. (2021) <a href=\"https:\/\/doi.org\/10.1007\/s12517-021-08734-4\" rel=\"noopener\">Geophysical modelling of the deep structure of the Richat magmatic intrusion (northern Mauritania): insights into its kinematics of emplacement<\/a>. <em>Arabian Journal of Geosciences<\/em>, 14(22), 2315.<\/li>\n<li>The Debrief (2021, April 16) <a href=\"https:\/\/thedebrief.org\/the-mysterious-eye-of-the-sahara-is-one-of-earths-strangest-marvels\/\" rel=\"noopener\">The Richat Structure: The \u201cEye of the Sahara\u201d is One of Earth\u2019s Strangest Marvels<\/a>. Accessed April 8, 2026.<\/li>\n<li>G\u00e9oconscience, <a href=\"https:\/\/www.geoconscience.com\/en\/portfolio\/adrar-plateau\/\" rel=\"noopener\">Adrar Plateau<\/a>. Accessed April 8, 2026.<\/li>\n<li>International Commission on Geoheritage, <a href=\"https:\/\/iugs-geoheritage.org\/geoheritage_sites\/richat-structure-a-cretaceous-alkaline-complex\/\" rel=\"noopener\">Richat Structure, A Cretaceous Alkaline Complex<\/a>. Accessed April 8, 2026.<\/li>\n<li>Matton, G., et al. (2005) <a href=\"https:\/\/doi.org\/10.1130\/G21542AR.1\" rel=\"noopener\">Resolving the Richat enigma: Doming and hydrothermal karstification above an alkaline complex<\/a>. <em>Geology<\/em>, 33 (8), 665-668.<\/li>\n<li>Matton, G. &#038; J\u00e9brak, M. (2014) <a href=\"https:\/\/doi.org\/10.1016\/j.jafrearsci.2014.04.006\" rel=\"noopener\">The \u201ceye of Africa\u201d (Richat dome, Mauritania): An isolated Cretaceous alkaline\u2013hydrothermal complex<\/a>. <em>Journal of African Earth Sciences<\/em>, 97, 109-124.<\/li>\n<li>NASA Earth Observatory (2022, July 10) <a href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/the-eye-of-sahara-150060\/\" rel=\"noopener\">The Eye of the Sahara<\/a>. Accessed April 8, 2026.<\/li>\n<li>National Archives (1965, June 4) <a href=\"https:\/\/catalog.archives.gov\/id\/5804919\" rel=\"noopener\">Richat Structure<\/a>. Accessed April 8, 2026.<\/li>\n<\/ul>\n<div id=\"\" class=\"hds-content-lists-inner hds-module hds-module-full alignfull wp-block-nasa-blocks-content-lists\">\n<div id=\"content-list-eb3ea451-c579-4df4-a3b4-e58f8b1e7d70\" class=\"hds-content-lists margin-y-3 padding-x-0 bg-spacesuit-white width-full maxw-full\" 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data-current-query=\"{\"block_id\":\"content-list-eb3ea451-c579-4df4-a3b4-e58f8b1e7d70\",\"categories\":\"\",\"content_categories\":\"\",\"exclude_child_terms\":false,\"exclude_child_pages\":false,\"layout\":\"grid\",\"listing_page\":\"no\",\"listing_page_category_id\":2151,\"meta_fields\":[],\"news_tags\":\"\",\"number_of_items\":3,\"order\":\"DESC\",\"orderby\":\"date\",\"current_page\":1,\"requesting_id\":1174771,\"science_only\":false,\"search_query\":\"\",\"show_content_type_tags\":\"yes\",\"show_excerpts\":\"yes\",\"show_pagination\":true,\"show_publish_date\":\"no\",\"show_readtime\":\"yes\",\"show_thumbnails\":\"yes\",\"science_org\":\"\",\"content_science_orgs\":\"\",\"internal_terms\":\"\",\"mission_programs\":\"\",\"mission_status\":\"\",\"mission_target\":\"\",\"mission_type\":\"\",\"response_format\":\"html\",\"show_drafts\":false,\"related_content\":\"1168371,1206740,1177605,1189006,1185870,1211417,1176121,1184882,1182904,1212436\",\"use_content_term_filters\":false,\"filter_logic\":\"default\",\"post_types\":\"any\",\"base_terms\":\"{\"category\":\"\",\"science-org\":\"6478\",\"internal-terms\":\"\",\"news-tags\":\"\"}\"}\">\n<div class=\"grid-container grid-container-widescreen padding-x-3\">\n<div class=\"grid-row flex-align-start margin-bottom-3\">\n<div class=\"desktop:grid-col-8 margin-bottom-2 desktop:margin-bottom-0\">\n<h2 class=\"section-heading-sm line-height-sm\">You may also be interested in:<\/h2>\n<p class=\"margin-top-0 margin-bottom-2 maxh-tablet\">Stay up-to-date with the latest content from NASA as we explore the universe and discover more about our home planet.<\/p>\n<\/p>\n<\/div>\n<\/div>\n<div class=\"grid-row grid-container grid-container-block padding-0 margin-0 flex-justify-center\">\n<div class=\" grid-col-12\">\n<div class=\"grid-row grid-container grid-container-block padding-0\" style=\"display: block\">\n<div id=\"filter-tags\" class=\"grid-col-12 filter-tags-container\"><\/div>\n<\/p>\n<\/div>\n<div class=\"smd-orbit-loader\" role=\"status\" aria-hidden=\"true\">\n<div class=\"orbit-plane\"><span class=\"orbit-dot\"><\/span><\/div>\n<\/div>\n<div id=\"post-list-container\" class=\"hds-content-items hds-content-items-grid margin-top-2\" aria-live=\"polite\" data-rest-url=\"https:\/\/science.nasa.gov\/wp-json\/smd\/v1\/content-list\">\n<div class=\"hds-content-item content-list-item-post\">\n                    <a href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/rings-of-rock-in-the-sahara\/\" class=\"hds-content-item-thumbnail\" rel=\"noopener\"><\/p>\n<figure class=\"hds-media-background  content-list-thumbnail\"><img decoding=\"async\" loading=\"lazy\" width=\"300px\" height=\"300px\" data-no-id=\"true\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" srcset=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2025\/rings-of-rock-in-the-sahara-\/iss073e0698446_th.jpg?fit=clip&#038;crop=faces%2Cfocalpoint&#038;w=300 300w\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" src=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2025\/rings-of-rock-in-the-sahara-\/iss073e0698446_th.jpg?fit=clip&#038;crop=faces%2Cfocalpoint&#038;%23038;w=300\" ><\/figure>\n<p>            <\/a><\/p>\n<div class=\"hds-content-item-inner\">\n            <a href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/rings-of-rock-in-the-sahara\/\" class=\"hds-content-item-heading\" rel=\"noopener\"><\/p>\n<div class=\"hds-a11y-heading-22\">Rings of Rock in the Sahara\u00a0<\/div>\n<p>            <\/a><\/p>\n<div class=\"hds-content-item-readtime label margin-bottom-1\">\n                    3 min read                <\/div>\n<p class=\"margin-top-0 margin-bottom-1\">In southeastern Libya, Jabal Arkan\u016b\u2019s concentric rock rings stand as relics of past geologic forces that churned beneath the desert.<\/p>\n<div class=\"display-flex flex-align-center label color-carbon-60 margin-bottom-auto\"><svg version=\"1.1\" class=\"square-2 margin-right-1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" x=\"0px\" y=\"0px\" width=\"16px\" height=\"16px\" viewBox=\"0 0 16 16\" style=\"enable-background:new 0 0 16 16;\" xml:space=\"preserve\"><g><g><path d=\"M8,0C3.5,0-0.1,3.7,0,8.2C0.1,12.5,3.6,16,8,16c4.4,0,8-3.6,8-8C16,3.5,12.4,0,8,0z M8,15.2 C4,15.2,0.8,12,0.8,8C0.8,4,4,0.8,8,0.8c3.9,0,7.2,3.2,7.2,7.1C15.2,11.9,12,15.2,8,15.2z\"\/><path d=\"M5.6,12c0.8-0.8,1.6-1.6,2.4-2.4c0.8,0.8,1.6,1.6,2.4,2.4c0-2.7,0-5.3,0-8C8.8,4,7.2,4,5.6,4 C5.6,6.7,5.6,9.3,5.6,12z\"\/><\/g><\/g><\/svg><span>Article<\/span><\/div>\n<\/p>\n<\/div>\n<\/div>\n<div class=\"hds-content-item content-list-item-post\">\n                    <a href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/a-bit-of-gray-in-an-emerald-isle\/\" class=\"hds-content-item-thumbnail\" rel=\"noopener\"><\/p>\n<figure class=\"hds-media-background  content-list-thumbnail\"><img decoding=\"async\" loading=\"lazy\" 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    <\/a><\/p>\n<div class=\"hds-content-item-readtime label margin-bottom-1\">\n                    3 min read                <\/div>\n<p class=\"margin-top-0 margin-bottom-1\">Ireland is best known for its many greens, but the striking grays of the island\u2019s Burren region also stand out\u2026<\/p>\n<div class=\"display-flex flex-align-center label color-carbon-60 margin-bottom-auto\"><svg version=\"1.1\" class=\"square-2 margin-right-1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" x=\"0px\" y=\"0px\" width=\"16px\" height=\"16px\" viewBox=\"0 0 16 16\" style=\"enable-background:new 0 0 16 16;\" xml:space=\"preserve\"><g><g><path d=\"M8,0C3.5,0-0.1,3.7,0,8.2C0.1,12.5,3.6,16,8,16c4.4,0,8-3.6,8-8C16,3.5,12.4,0,8,0z M8,15.2 C4,15.2,0.8,12,0.8,8C0.8,4,4,0.8,8,0.8c3.9,0,7.2,3.2,7.2,7.1C15.2,11.9,12,15.2,8,15.2z\"\/><path d=\"M5.6,12c0.8-0.8,1.6-1.6,2.4-2.4c0.8,0.8,1.6,1.6,2.4,2.4c0-2.7,0-5.3,0-8C8.8,4,7.2,4,5.6,4 C5.6,6.7,5.6,9.3,5.6,12z\"\/><\/g><\/g><\/svg><span>Article<\/span><\/div>\n<\/p>\n<\/div>\n<\/div>\n<div class=\"hds-content-item content-list-item-post\">\n                    <a href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/the-towers-of-trang-an\/\" class=\"hds-content-item-thumbnail\" rel=\"noopener\"><\/p>\n<figure class=\"hds-media-background  content-list-thumbnail\"><img decoding=\"async\" loading=\"lazy\" width=\"300px\" height=\"300px\" data-no-id=\"true\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" srcset=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2025\/the-towers-of-tr\u00e0ng-an\/vietnam_trangan_oli2_20250602_th.jpg?fit=clip&#038;crop=faces%2Cfocalpoint&#038;w=300 300w\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" src=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2025\/the-towers-of-tr%C3%A0ng-an\/vietnam_trangan_oli2_20250602_th.jpg?fit=clip&#038;crop=faces%2Cfocalpoint&#038;%23038;w=300\" ><\/figure>\n<p>            <\/a><\/p>\n<div class=\"hds-content-item-inner\">\n            <a href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/the-towers-of-trang-an\/\" class=\"hds-content-item-heading\" rel=\"noopener\"><\/p>\n<div class=\"hds-a11y-heading-22\">The Towers of Tr\u00e0ng An<\/div>\n<p>            <\/a><\/p>\n<div class=\"hds-content-item-readtime label margin-bottom-1\">\n                    3 min read                <\/div>\n<p class=\"margin-top-0 margin-bottom-1\">Over millions of years, water has sculpted limestone in northern Vietnam into an extraordinary karst landscape full of towers, cones,\u2026<\/p>\n<div class=\"display-flex flex-align-center label color-carbon-60 margin-bottom-auto\"><svg version=\"1.1\" class=\"square-2 margin-right-1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" x=\"0px\" y=\"0px\" width=\"16px\" height=\"16px\" viewBox=\"0 0 16 16\" style=\"enable-background:new 0 0 16 16;\" xml:space=\"preserve\"><g><g><path d=\"M8,0C3.5,0-0.1,3.7,0,8.2C0.1,12.5,3.6,16,8,16c4.4,0,8-3.6,8-8C16,3.5,12.4,0,8,0z M8,15.2 C4,15.2,0.8,12,0.8,8C0.8,4,4,0.8,8,0.8c3.9,0,7.2,3.2,7.2,7.1C15.2,11.9,12,15.2,8,15.2z\"\/><path d=\"M5.6,12c0.8-0.8,1.6-1.6,2.4-2.4c0.8,0.8,1.6,1.6,2.4,2.4c0-2.7,0-5.3,0-8C8.8,4,7.2,4,5.6,4 C5.6,6.7,5.6,9.3,5.6,12z\"\/><\/g><\/g><\/svg><span>Article<\/span><\/div>\n<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"pagination-container\" class=\"pagination\">\n<nav class=\"hds-pagination hds-pagination--content-lists\" role=\"navigation\" aria-label=\"Pagination Navigation\" data-mid-size=\"2\" data-end-size=\"1\" data-max-pages=\"4\" >\n<span aria-current=\"page\" class=\"page-numbers current\" aria-label=\"Current Page, Page 1\" aria-current=\"true\" data-page-number=\"1\"><br \/>\n<span>1<\/span><\/span><br \/>\n<a class=\"page-numbers\" href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/eyeing-the-richat-structure\/#\" aria-label=\"Goto Page 2\" data-page-number=\"2\"><br \/>\n<span>2<\/span><\/a><br \/>\n<a class=\"page-numbers\" href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/eyeing-the-richat-structure\/#\" aria-label=\"Goto Page 3\" data-page-number=\"3\"><br \/>\n<span>3<\/span><\/a><br \/>\n<a class=\"page-numbers\" href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/eyeing-the-richat-structure\/#\" aria-label=\"Goto Page 4\" data-page-number=\"4\"><br \/>\n<span>4<\/span><\/a><br \/>\n<a class=\"next page-numbers\" href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/eyeing-the-richat-structure\/#\" aria-label=\"Goto Next Page\" data-page-number=\"2\">Next<\/a><br \/>\n<\/nav>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"\" class=\"hds-topic-cards nasa-gb-align-full maxw-full width-full padding-y-6 padding-x-3 color-mode-dark hds-module hds-module-full alignfull wp-block-nasa-blocks-topic-cards\">\n<div class=\"grid-container grid-container-block-lg padding-x-0\">\n<div class=\"grid-row flex-align-center margin-bottom-3\">\n<div class=\"desktop:grid-col-8 margin-bottom-2 desktop:margin-bottom-0\">\n<div class=\"label color-carbon-60 margin-bottom-2\">Keep Exploring<\/div>\n<h2 class=\"heading-36 line-height-sm\">Discover More from NASA Earth Science<\/h2>\n<\/p>\n<\/div>\n<\/div>\n<div class=\"grid-row grid-gap-2 hds-topic-cards-wrapper\">\n\t\t\t\t\t<a href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/subscribe\/\" class=\"mobile:grid-col-12 tablet:grid-col-6 desktop:grid-col-3 topic-card margin-bottom-4 desktop:margin-bottom-0\" rel=\"noopener\"><\/p>\n<div class=\"hds-topic-card hds-cover-wrapper cover-hover-zoom bg-carbon-black\">\n<div class=\"skrim-overlay skrim-overlay-dark skrim-left mobile-skrim-top padding-3 display-flex flex-align-end flex-justify-start z-200\">\n<div>\n<h3 class=\"hds-topic-card-heading heading-29 color-spacesuit-white line-height-sm margin-top-0 margin-bottom-1\">\n\t\t\t\t\t\t\t\t<span>Subscribe to Earth Observatory Newsletters<\/span><br \/>\n\t\t\t\t\t\t\t\t<svg viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"color-nasa-red\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg><br \/>\n\t\t\t\t\t\t\t<\/h3>\n<p class=\"margin-bottom-0 margin-top-2 color-carbon-20-important\">Subscribe to the Earth Observatory and get the Earth in your inbox.<\/p>\n<\/p>\n<\/div>\n<\/div>\n<figure class=\"hds-media-background  \"><img decoding=\"async\" width=\"585\" height=\"425\" src=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/about\/NASA-EO-Logo-mediumBlue2016-stacked-mark.png?w=585&#038;h=425&#038;%23038;fit=clip&#038;%23038;crop=faces%2Cfocalpoint\" class=\"attachment-1536x1536 size-1536x1536\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" loading=\"lazy\" srcset=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/about\/NASA-EO-Logo-mediumBlue2016-stacked-mark.png?w=585&#038;h=425&#038;fit=crop&#038;crop=faces%2Cfocalpoint 585w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/about\/NASA-EO-Logo-mediumBlue2016-stacked-mark.png?w=300&#038;h=218&#038;fit=crop&#038;crop=faces%2Cfocalpoint 300w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/about\/NASA-EO-Logo-mediumBlue2016-stacked-mark.png?w=400&#038;h=291&#038;fit=crop&#038;crop=faces%2Cfocalpoint 400w\" sizes=\"auto, (max-width: 585px) 100vw, 585px\" \/><\/figure>\n<\/p>\n<\/div>\n<p>\t\t\t<\/a><br \/>\n\t\t\t\t\t<a href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/image-of-the-day\/\" class=\"mobile:grid-col-12 tablet:grid-col-6 desktop:grid-col-3 topic-card margin-bottom-4 desktop:margin-bottom-0\" rel=\"noopener\"><\/p>\n<div class=\"hds-topic-card hds-cover-wrapper cover-hover-zoom bg-carbon-black\">\n<div class=\"skrim-overlay skrim-overlay-dark skrim-left mobile-skrim-top padding-3 display-flex flex-align-end flex-justify-start z-200\">\n<div>\n<h3 class=\"hds-topic-card-heading heading-29 color-spacesuit-white line-height-sm margin-top-0 margin-bottom-1\">\n\t\t\t\t\t\t\t\t<span>Earth Observatory Image of the Day<\/span><br \/>\n\t\t\t\t\t\t\t\t<svg viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"color-nasa-red\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg><br \/>\n\t\t\t\t\t\t\t<\/h3>\n<p class=\"margin-bottom-0 margin-top-2 color-carbon-20-important\">NASA&#8217;s Earth Observatory brings you the Earth, every day, with in-depth stories and stunning imagery.<\/p>\n<\/p>\n<\/div>\n<\/div>\n<figure class=\"hds-media-background  \"><img decoding=\"async\" width=\"2500\" height=\"1407\" src=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=2500&#038;h=1407&#038;%23038;fit=clip&#038;%23038;crop=faces%2Cfocalpoint\" class=\"attachment-1536x1536 size-1536x1536\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" loading=\"lazy\" srcset=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=2500&#038;h=1407&#038;fit=crop&#038;crop=faces%2Cfocalpoint 2500w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=300&#038;h=169&#038;fit=crop&#038;crop=faces%2Cfocalpoint 300w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=768&#038;h=432&#038;fit=crop&#038;crop=faces%2Cfocalpoint 768w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=1024&#038;h=576&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1024w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=1536&#038;h=864&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1536w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=2048&#038;h=1153&#038;fit=crop&#038;crop=faces%2Cfocalpoint 2048w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=400&#038;h=225&#038;fit=crop&#038;crop=faces%2Cfocalpoint 400w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=600&#038;h=338&#038;fit=crop&#038;crop=faces%2Cfocalpoint 600w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=900&#038;h=507&#038;fit=crop&#038;crop=faces%2Cfocalpoint 900w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=1200&#038;h=675&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1200w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=2000&#038;h=1126&#038;fit=crop&#038;crop=faces%2Cfocalpoint 2000w\" sizes=\"auto, (max-width: 2500px) 100vw, 2500px\" \/><\/figure>\n<\/p>\n<\/div>\n<p>\t\t\t<\/a><br \/>\n\t\t\t\t\t<a href=\"https:\/\/science.nasa.gov\/earth\/explore\/\" class=\"mobile:grid-col-12 tablet:grid-col-6 desktop:grid-col-3 topic-card margin-bottom-4 desktop:margin-bottom-0\" rel=\"noopener\"><\/p>\n<div class=\"hds-topic-card hds-cover-wrapper cover-hover-zoom bg-carbon-black\">\n<div class=\"skrim-overlay skrim-overlay-dark skrim-left mobile-skrim-top padding-3 display-flex flex-align-end flex-justify-start z-200\">\n<div>\n<p class=\"hds-topic-card-heading heading-29 color-spacesuit-white line-height-sm margin-top-0 margin-bottom-1\">\n\t\t\t\t\t\t\t\t<span>Explore Earth Science<\/span><br \/>\n\t\t\t\t\t\t\t\t<svg viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"color-nasa-red\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/p>\n<\/p>\n<\/div>\n<\/div>\n<figure class=\"hds-media-background  \"><img decoding=\"async\" width=\"1920\" height=\"1920\" src=\"https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=1920&#038;h=1920&#038;%23038;fit=clip&#038;%23038;crop=faces%2Cfocalpoint\" class=\"attachment-1536x1536 size-1536x1536\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" loading=\"lazy\" srcset=\"https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=1920&#038;h=1920&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1920w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=150&#038;h=150&#038;fit=crop&#038;crop=faces%2Cfocalpoint 150w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=300&#038;h=300&#038;fit=crop&#038;crop=faces%2Cfocalpoint 300w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=768&#038;h=768&#038;fit=crop&#038;crop=faces%2Cfocalpoint 768w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=1024&#038;h=1024&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1024w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=1536&#038;h=1536&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1536w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=50&#038;h=50&#038;fit=crop&#038;crop=faces%2Cfocalpoint 50w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=100&#038;h=100&#038;fit=crop&#038;crop=faces%2Cfocalpoint 100w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=200&#038;h=200&#038;fit=crop&#038;crop=faces%2Cfocalpoint 200w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=400&#038;h=400&#038;fit=crop&#038;crop=faces%2Cfocalpoint 400w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=600&#038;h=600&#038;fit=crop&#038;crop=faces%2Cfocalpoint 600w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=900&#038;h=900&#038;fit=crop&#038;crop=faces%2Cfocalpoint 900w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=1200&#038;h=1200&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1200w\" sizes=\"auto, (max-width: 1920px) 100vw, 1920px\" \/><\/figure>\n<\/p>\n<\/div>\n<p>\t\t\t<\/a><br \/>\n\t\t\t\t\t<a href=\"https:\/\/science.nasa.gov\/earth\/data\/\" class=\"mobile:grid-col-12 tablet:grid-col-6 desktop:grid-col-3 topic-card margin-bottom-4 desktop:margin-bottom-0\" rel=\"noopener\"><\/p>\n<div class=\"hds-topic-card hds-cover-wrapper cover-hover-zoom bg-carbon-black\">\n<div class=\"skrim-overlay skrim-overlay-dark skrim-left mobile-skrim-top padding-3 display-flex flex-align-end flex-justify-start z-200\">\n<div>\n<h3 class=\"hds-topic-card-heading heading-29 color-spacesuit-white line-height-sm margin-top-0 margin-bottom-1\">\n\t\t\t\t\t\t\t\t<span>Earth Science Data<\/span><br \/>\n\t\t\t\t\t\t\t\t<svg viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"color-nasa-red\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg><br \/>\n\t\t\t\t\t\t\t<\/h3>\n<p class=\"margin-bottom-0 margin-top-2 color-carbon-20-important\">Open access to NASA\u2019s archive of Earth science data<\/p>\n<\/p>\n<\/div>\n<\/div>\n<figure class=\"hds-media-background  \"><img decoding=\"async\" width=\"1536\" height=\"768\" src=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png?w=1536\" class=\"attachment-1536x1536 size-1536x1536\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" loading=\"lazy\" srcset=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png 3600w, https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png?resize=300,150 300w, https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png?resize=768,384 768w, https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png?resize=1024,512 1024w, https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png?resize=1536,768 1536w, https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png?resize=2048,1024 2048w, https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png?resize=400,200 400w, https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png?resize=600,300 600w, https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png?resize=900,450 900w, https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png?resize=1200,600 1200w, https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png?resize=2000,1000 2000w\" sizes=\"auto, (max-width: 1536px) 100vw, 1536px\" \/><\/figure>\n<\/p>\n<\/div>\n<p>\t\t\t<\/a>\n\t\t\t\t<\/div>\n<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>The circular geologic feature in northwestern Africa can be hard to recognize from the ground, but it is obvious when viewed from space.<\/p>\n","protected":false},"author":13,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[16994,17944,19151,19152],"tags":[],"class_list":["post-406730","post","type-post","status-publish","format-standard","hentry","category-earth-observatory","category-landsat-8-ldcm-landsat-data-continuity-mission","category-landsat-9","category-topography"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=\/wp\/v2\/posts\/406730","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=\/wp\/v2\/users\/13"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=406730"}],"version-history":[{"count":3,"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=\/wp\/v2\/posts\/406730\/revisions"}],"predecessor-version":[{"id":407844,"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=\/wp\/v2\/posts\/406730\/revisions\/407844"}],"wp:attachment":[{"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=406730"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=406730"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=406730"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}