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Card 16

Front

Where do the oceans and atmosphere come from?

Back

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Card 17

Front

How old is the oldest zircon grain?

Back

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Card 18

Front

How old are the oldest rocks still with us at the surface of the Earth?

Back

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Card 19

Front

Name two gases that were abundant in the earliest atmosphere.

Back

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Card 20

Front

When was the ‘late heavy bombardment’?

Back

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Card 21

Front

How old are the oldest sedimentary rocks?

Back

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Card 22

Front

How old is the first proposed evidence for life on Earth?

Back

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Card 23

Front

What is a ‘stromatolite’?

Back

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Card 24

Front

How old are the oldest fossils of life?

Back

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Card 25

Front

Who came up with the theory of continental drift?

Back

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