地球大氣圈的變化英文版(編輯修改稿)
2025-04-18 04:57 本頁面
【文章內(nèi)容簡(jiǎn)介】 cosmic rays Differentiation of the Earth ? Cooled enough to form crust, heavily populated with volcanoes ? Formation of magic field that deflects the solar wind and cosmic rays ? Increasing volcano activity, releasing gases into atmosphere Earth’s Second Atmosphere ? Around 4 billion years ago ? Composition similar to gases released from volcanoes (CO2, water vapor, nitrogen) ? Large concentration of gases in the atmosphere (100 times of today’s) ? Greenhouse effect keeps the earth from freezing Earth Begins to Cool ? Water condenses to form oceans ? Carbon Dioxide dissolves into oceans eventually forming carbonates ? Nitrogen bees major ponent of the atmosphere Life and oxygen ? Around billion years ago cyanobateria were known to be carrying out photosynthesis CO2 + H2O + sunlight = anic pounds + O2 ? Eukaryotes capable of respiration emerge around billion years ago. Photosynthesis bees more efficient ? Increased oxygen concentration, around 1% of atmosphere, produced the ozone layer ? Life emerges outside of the oceans. Formation of terrestrial plants lead to atmospheric saturation of oxygen Earth’s third atmosphere (current) ? Reached around 400 million years ago ? Consist
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