[quote] Our atmosphere began to develop gases...[/quote]Why?
English
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As time progressed and the earth cooled down, simple gases (i.e. Hydrogen and Helium) started to form into more complex gases (i.e Nitrogen and Oxygen)
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So is our planet in a state of cooling down?
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No, it was super hot during its creation but has since cooled down.
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Is it still cooling down?
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I'm personally not sure, but if it is then it is cooling at a much slower rate then it was in my example.