More cards in this set

Card 6

Front

What was constantly bombing the Earth around 4.5 billion years ago?

Back

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Card 7

Front

The atmosphere mainly consisted of what 4.5 billion years ago?

Back

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Card 8

Front

Why was it like this?

Back

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Card 9

Front

What happened to temperatures later?

Back

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Card 10

Front

What does the Greenhouse gas effect do to our atmosphere?

Back

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Card 11

Front

What are particulates?

Back

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