What causes the modern atmosphere to evolve?

Answer

The more oxygen there was the more it evolve.
Q&A Related to "What causes the modern atmosphere to evolve?"
well at the start, when the earth was formed there was NO oxygen present in the atmosphere Marie. it was mainly carbon dioxide and sulfate gases. then 2.5 billion years ago stromatolites
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Follow the link below it should help you out. Source(s): http://science.howstuffworks.com/nature/…
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Rates of chemical weathering increased and carbon dioxide
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