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Card 6

Front

What is the Earth's crust and upper part of the mantle cracked into?

Back

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Card 7

Front

What causes tectonic plates to move?

Back

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Card 8

Front

What was Alfred Wegners idea?

Back

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Card 9

Front

Why were Wegner's ideas not accepted for many years?

Back

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Card 10

Front

In the first billion years what was the atmosphere like?

Back

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Card 11

Front

How did oceans form?

Back

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Card 12

Front

What other elements did scientists believe were present int he early atmosphere?

Back

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Card 13

Front

What produced the oxygen in the atmosphere?

Back

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Card 14

Front

Why are we not sure about how life began?

Back

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Card 15

Front

What was the miller-urey experiment

Back

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