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chemistry > booklet 9-the composition and evolution of the Earth's atmosphere > Flashcards

booklet 9-the composition and evolution of the Earth's atmosphere Flashcards

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1
Q

what percentage of the Earth’s atmosphere today is Nitrogen

A

78%

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2
Q

what percentage of the Earth’s atmosphere is oxygen

A

21%

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3
Q

what percentage of the Earth’s atmosphere today is others including argon and carbon dioxide

A

1%

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4
Q

when do scientists believe the earth was formed

A

4.6 billion years ago

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