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 | Oh wow thank you for your help, I think I will pass | |
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| Don't forget! 600 million years ago a protective layer of the atmosphere called the ozone layer formed. | |
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| What would it be like without it ? | |
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| There would be no life on land because that protects the UV rays from the sun. | |
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| Now as modern humans we have romaed this Earth for about 200,000 years and the Earth's atmosphere is about 78% Nitrogen, 21% oxygen, and what else? | |
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| Less than 1% carbon dioxide. | |
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