SME
Grade 12 Science · Problem type
Early Earth’s air and today’s
Use this for “How was Earth’s early atmosphere different from today’s, and what changed it?”
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Does it describe early Earth’s air or today’s air?
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Assumptions
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The first lasting air came from gases released by volcanoes.
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Photosynthesis added the oxygen; rain, rock and life took out most of the carbon dioxide.
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Earth's history: the early Earth, its atmosphere and the history of life
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Use this for “How did the first photosynthesis change Earth’s air, and what did it leave in the rocks?”
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Use this for “Put the major steps in the history of life in order, from the first cells to humans.”