{"page":"\u003clink rel=\"stylesheet\" href=\"https://lessonplanet.com/assets/packs/css/resources-c03aa079.css\" /\u003e\n\u003clink rel=\"stylesheet\" href=\"https://lessonplanet.com/assets/packs/css/lp_boclips_stylesheets-517835be.css\" media=\"all\" /\u003e\n\u003cdiv data-title='How Has The Atmosphere Changed' data-url='/boclips/videos/634c05d1f0c50125a1d070b4' data-video-url='/boclips/videos/634c05d1f0c50125a1d070b4' id='bo_player_modal'\u003e\n\u003cdiv class='boclips-resource-page modal-dialog panel-container'\u003e\n\u003cdiv class='react-notifications-root'\u003e\u003c/div\u003e\n\u003cdiv class='rp-header'\u003e\n\u003cdiv class='rp-type'\u003e\n\u003ci aria-hidden='true' class='fai fa-regular fa-circle-play'\u003e\u003c/i\u003e\nVideo\n\u003c/div\u003e\n\u003ch1 class='rp-title' id='video-title'\u003e\nHow Has The Atmosphere Changed\n\u003c/h1\u003e\n\u003cdiv class='rp-actions'\u003e\n\u003cdiv class='mr-1'\u003e\n\u003ca class=\"btn btn-success\" data-posthog-event=\"Signup: LP Signup Activity\" data-posthog-location=\"body_link_boclips\" data-remote=\"true\" href=\"/subscription/new\"\u003e\u003cspan\u003e\u003cspan\u003eGet Free Access\u003c/span\u003e\u003cspan class=\"\"\u003e for 10 Days\u003c/span\u003e\u003cspan\u003e!\u003c/span\u003e\u003c/span\u003e\u003c/a\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003cdiv class='rp-body'\u003e\n\u003cdiv class='rp-info'\u003e\n\u003cdiv aria-label='Hide resource details' class='rp-hide-info' role='button' tabindex='0'\u003e\u0026times;\u003c/div\u003e\n\u003ci aria-label='Expand resource details' class='rp-expand-info fai fa-solid fa-up-right-and-down-left-from-center' role='button' tabindex='0'\u003e\u003c/i\u003e\n\u003ci aria-label='Compress resource details' class='rp-compress-info fai fa-solid fa-down-left-and-up-right-to-center' role='button' tabindex='0'\u003e\u003c/i\u003e\n\u003cdiv class='rp-rating'\u003e\n\u003cspan class='resource-pool'\u003e\n\u003cspan class='pool-label'\u003ePublisher:\u003c/span\u003e\n\u003cspan class='pool-name'\u003e\n\u003cspan class='text'\u003e\u003ca data-publisher-id=\"30356647\" href=\"/search?publisher_ids%5B%5D=30356647\"\u003eFuseSchool\u003c/a\u003e\u003c/span\u003e\n\u003c/span\u003e\n\u003c/span\u003e\n\u003c/div\u003e\n\u003cdiv class='rp-description'\u003e\n\u003cspan class='short-description'\u003eLearn the basics about the changes to our atmosphere, as a part of environmental chemistry.The Earth’s early atmosphere had no oxygen. By examining rocks laid down over earth history we can piece together the story of our atmosphere, to...\u003c/span\u003e\n\u003cspan class='full-description hide'\u003eLearn the basics about the changes to our atmosphere, as a part of environmental chemistry.\u003cbr/\u003e\u003cbr/\u003eThe Earth’s early atmosphere had no oxygen. By examining rocks laid down over earth history we can piece together the story of our atmosphere, to the present day where mankind has polluted the atmosphere.\u003cbr/\u003e\u003cbr/\u003e4.5 billion years ago the atmosphere probably was made mostly of nitrogen, with some carbon dioxide, water vapour and hydrogen compounds such as methane and ammonia. \u003cbr/\u003e\u003cbr/\u003eWithin 800 million years life evolved in the oceans.\u003cbr/\u003e\u003cbr/\u003e3.2 billion years ago photosynthesis had evolved with the first oxygen producing cyanobacteria, similar to today’s blue-green algae. At first the oxygen given off simply reacted with the rocks, but gradually it built up in the oceans and started to bubble out into the atmosphere. To start with it was a toxic gas harmful to life, but soon life evolved to make use of the oxygen through aerobic respiration. \u003cbr/\u003e\u003cbr/\u003eBy 2 billion years ago, about half-way through earth’s history, there was oxygen in the atmosphere. \u003cbr/\u003e\u003cbr/\u003eWithout oxygen there was no ozone in the upper atmosphere, so UV light from the sun rained down on the land making it impossible for life to exist except under water where the UV could not reach. \u003cbr/\u003e\u003cbr/\u003eMoving to the land was difficult for plants which relied on the water to support them, and it was not until about 400 million years\u003cbr/\u003eago, that life learned to live on land. The atmosphere remained much the same until the present day: mostly nitrogen, with 21% oxygen and just enough carbon dioxide to give plants their carbon during photosynthesis.\u003cbr/\u003e\u003cbr/\u003eAbout 100 years ago mankind started to change the atmosphere. We found seams of coal and pockets of oil and natural gas under ground and began extracting them and reacting them with the oxygen in the atmosphere, increasing the carbon dioxide concentration.\u003c/span\u003e\n\u003c/div\u003e\n\u003cdiv class='action-container flex justify-between'\u003e\n\u003cbutton aria-expanded='false' aria-label='Read more description' class='rp-full-description' type='button'\u003e\n\u003ci class='fai fa-solid fa-align-left'\u003e\u003c/i\u003e\n\u003cspan id='read_more'\u003eRead More\u003c/span\u003e\n\u003c/button\u003e\n\u003cdiv class='rp-report'\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003cdiv aria-labelledby='resource-details-heading' class='rp-info-section'\u003e\n\u003ch2 class='title' id='resource-details-heading'\u003eResource Details\u003c/h2\u003e\n\u003cdiv class='rp-resource-details clearfix'\u003e\n\u003cdiv class='detail'\u003e\n\u003cdl\u003e\n\u003cdt\u003eCurator Rating\u003c/dt\u003e\n\u003cdd\u003e\u003cspan class=\"star-rating\" 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mr5\"\u003e\u003c/i\u003e12 more...\u003c/dd\u003e\n\u003c/dl\u003e\n\u003c/div\u003e\n\u003cdiv class='detail'\u003e\n\u003cdl\u003e\n\u003cdt\u003eMedia Type\u003c/dt\u003e\u003cdd\u003e\u003cspan\u003e\u003ca href=\"/search?grade_ids%5B%5D=258\u0026amp;grade_ids%5B%5D=259\u0026amp;grade_ids%5B%5D=252\u0026amp;grade_ids%5B%5D=253\u0026amp;grade_ids%5B%5D=254\u0026amp;grade_ids%5B%5D=255\u0026amp;grade_ids%5B%5D=256\u0026amp;grade_ids%5B%5D=257\u0026amp;search_tab_id=2\u0026amp;type_ids%5B%5D=4543647\"\u003eInstructional Videos\u003c/a\u003e\u003c/span\u003e\u003c/dd\u003e\n\u003c/dl\u003e\n\u003c/div\u003e\n\u003cdiv class='detail'\u003e\n\u003cdl\u003e\n\u003cdt\u003eSource:\u003c/dt\u003e\n\u003cdiv class='preview-source' data-animation='true' data-boundary='.rp-info' data-container='.rp-resource-details' data-html='false' data-title='Education for anyone, anywhere' data-trigger='hover focus'\u003e\n\u003cspan\u003eFuseSchool - Global Education\u003c/span\u003e\n\u003ci 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gcse, alevels, aqa, students free online courses video science videos, student, fuseschool, global education, ict4d, atmosphere, change to atmosphere, history of earth, earth, atmosphere formation, cyanobacteria, ozone layer, life evolved, evolved, ozone, give, began, history, land, life, video, mankind, story, started, start, presence, sign, place\u003c/div\u003e\n\u003cdiv class='keyterms-toggle-buttons' data-identifier='Boclips::VideoDecorator634c05d1f0c50125a1d070b4'\u003e\n\u003cbutton aria-expanded='false' class='more btn-link' type='button'\u003e\n\u003cspan\u003eShow More\u003c/span\u003e\n\u003ci aria-hidden='true' class='fa-solid fa-caret-down ml5'\u003e\u003c/i\u003e\n\u003c/button\u003e\n\u003cbutton aria-expanded='true' class='less btn-link' style='display: none;' type='button'\u003e\n\u003cspan\u003eShow Less\u003c/span\u003e\n\u003ci aria-hidden='true' class='fa-solid fa-caret-up 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