From Volcanic Gas to Oxygen: How Earth Built Its Breathable Air
In short: This video breaks down the geological and biological shifts that transformed our planet from a toxic wasteland into a life-sustaining atmosphere. It is essential viewing for understanding the chemical evolution of our world.
The early Earth's atmosphere was dominated by carbon dioxide, released primarily through intense volcanic activity. A major shift occurred as water vapor condensed to form the oceans, which began absorbing large amounts of atmospheric carbon dioxide.
The rise of algae and green plants introduced photosynthesis, a process that significantly reduced carbon dioxide levels while increasing oxygen. Over time, carbon was further 'locked away' as dead marine organisms formed sedimentary rocks like limestone, and remains of plants and plankton transformed into fossil fuels such as coal, natural gas, and crude oil.
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Sources
- Summary by Intellect · source: GCSE Chemistry - Evolution of the Atmosphere | How the Atmosphere Changed Over Time (2027/28 exams)
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