{"id":373,"date":"2018-08-13T11:39:00","date_gmt":"2018-08-13T09:39:00","guid":{"rendered":"https:\/\/kids.esa.int\/earth_is_surprisingly_squishy\/"},"modified":"2026-10-08T00:27:25","modified_gmt":"2026-10-07T22:27:25","slug":"earth_is_surprisingly_squishy","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/da\/earth_is_surprisingly_squishy\/","title":{"rendered":"Jorden er overraskende bl\u00f8d!"},"content":{"rendered":"<div class=\"lede\">\n<p>For 20.000 \u00e5r siden befandt Jorden sig i en istid! St\u00f8rstedelen af vores planet var d\u00e6kket af is, der mange steder var 3 km tyk, ligesom i dele af Antarktis og Gr\u00f8nland i dag. Forskere har unders\u00f8gt, hvordan Jordens overflade \u00e6ndrer sig, n\u00e5r den er d\u00e6kket af tykt islag, og hvad der sker, n\u00e5r isen smelter. De har gjort en uventet opdagelse!<\/p>\n<\/div>\n<p>Jordens h\u00e5rde, stenede skorpe \u2013 som omfatter den jord, vi g\u00e5r p\u00e5 \u2013 ligger oven p\u00e5 et 2900 km tykt lag, der kaldes mantlen. Dette lag er ret bl\u00f8dt og opf\u00f8rer sig som en tyk v\u00e6ske. N\u00e5r skorpen ovenp\u00e5 er tungere, som den var tidligere, da den var d\u00e6kket af is, bliver mantlen presset ned. Under den sidste istid sank landomr\u00e5derne under den tykkeste is med op til 500 m!<\/p>\n<p>Til sidst smeltede det meste af isen, og uden al den v\u00e6gt, der trykkede ned, steg mantlen op igen. Den stiger stadig, selv i dag, om end i et langsommere tempo. Jorden er alts\u00e5 lidt ligesom din madras \u2013 n\u00e5r du ligger oven p\u00e5 den, bliver madrassen trykket sammen. Men n\u00e5r du hopper af, stiger den langsomt op igen!<\/p>\n<p><i>Vestanantarktis h\u00e6ver sig. Ophavsret: Planetary Visions (kilde: ESA\/Planetary Visions)<\/i>.<\/p>\n<p>En gruppe forskere brugte GPS-data (Global Positioning Satellite) til at m\u00e5le Antarktis\u2019 h\u00f8jde. Da kontinentet stadig er d\u00e6kket af tykt islag \u2013 om end ikke s\u00e5 tykt som under istiden \u2013 ville man forvente, at landmassen kun ville h\u00e6ve sig langsomt. De blev overraskede over at opdage, at en del af kontinentet faktisk h\u00e6ver sig hurtigere end n\u00e6sten alle andre steder p\u00e5 Jorden! Dette er interessant, fordi det giver ny indsigt i, hvordan mantlen nedenunder muligvis ser ud.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"3508\" data-credit=\"ESA \/AOES Medialab\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2018\/08\/GOCE_in_orbit\" data-licence=\"ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2018\/08\/goce_in_orbit\/17888505-2-eng-GB\/GOCE_in_orbit.jpg\" alt=\"GOCE in orbit\"><figcaption>GOCE i kredsl\u00f8b<\/figcaption><\/figure>\n<p>For at underst\u00f8tte denne unders\u00f8gelse anvendte forskerne data fra en ESA-rummission kaldet Gravity field and steady-state Ocean Circulation Explorer, eller GOCE for kort. GOCE har kortlagt tyngdefeltet omkring Jorden, hvilket er en smart m\u00e5de at finde ud af, hvad der foreg\u00e5r under overfladen. Hvis der er meget t\u00e6t materiale under jorden, er tyngdefeltet lidt st\u00e6rkere. S\u00e5 GOCE-dataene kan fort\u00e6lle os, hvor fast mantlen er.<\/p>\n<p>GOCE-missionen sluttede i 2013, men dens data er helt klart stadig meget v\u00e6rdifulde! Den har afsl\u00f8ret, at mantlen faktisk er bl\u00f8dere, end vi troede, meget flydende og bev\u00e6ger sig hurtigt \u2013 hvilket forklarer, hvorfor der blev observeret s\u00e5 hurtige stigninger i Antarktis.<\/p>\n<p>Denne forskning er en fantastisk m\u00e5de at l\u00e6re mere om, hvordan vores hjemplanet, Jorden, ser ud indeni!<\/p>\n<p><b>Sjovt faktum:<\/b> GOCE blev konstrueret uden mange af de bev\u00e6gelige dele, man ser i andre rumfart\u00f8jer, da bev\u00e6gelser kunne forstyrre dets tyngdekraftsm\u00e5linger!<\/p>","protected":false},"excerpt":{"rendered":"<p>20,000 years ago, Earth was in an Ice Age! Most of our planet was covered in ice, in many places 3km thick, like parts of Antarctica and Greenland today. Scientists [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2018\/08\/antarctica_in_3d\/17869709-2-eng-GB\/Antarctica_in_3D.jpg","esa_banner_description":"Antarctica in 3D","esa_banner_credit":"CPOM","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2018\/08\/Antarctica_in_3D","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[42,10,43],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-373","post","type-post","status-publish","format-standard","hentry","category-earth","category-learn","category-protecting-earth"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/373","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/comments?post=373"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/373\/revisions"}],"predecessor-version":[{"id":4421,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/373\/revisions\/4421"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=373"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=373"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=373"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=373"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=373"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=373"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=373"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=373"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=373"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=373"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}