When did Earth's atmosphere form and what was the earliest atmosphere made up of?
4.6 billion years ago- mostly carbon dioxide and small amounts of ammonia and methane
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What did ancient volcanoes release?
Carbon Dioxide
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How did the oceans form?
Large amounts of water vapor condensed
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How did oxygen levels increase and how did this result in higher life forms?
Algae and plants produced oxygen through photosynthesis which allowed for more advanced lifeforms to evolve.
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Give reasons for the decrease in levels of Carbon Dioxide
1. Trapped in sedimentary rocks 2. Contained in the ocean 3. It was absorbed during photosynthesis.
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Write a balanced equation for photosynthesis
6CO(2) + 6H(2)0 = C(6)H(12)O(6) + 60(2)
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Explain why the evolution of the atmosphere is a theory
There is no solid proof as no one lived that long to confirm
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What is locked up carbon dioxide?
Carbon dioxide that has been taken out of the atmosphere and trapped inside oceans, sedimentary rocks, volcanoes etc. from billions and billions of years ago.
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What has the composition of the atmosphere been for the last 200 millions years?
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