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Card 6

Front

Why is it difficult to study the inner structure of the Earth?

Back

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Card 7

Front

How do scientists study the Earth's structure?

Back

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Card 8

Front

What are the two types of seismic waves?

Back

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Card 9

Front

Discoveries about the Earth's structure?

Back

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Card 10

Front

What did Alfred Wegener hypothise?

Back

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Card 11

Front

What evidence did he provide for his theory?

Back

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Card 12

Front

Explain Wegener's theory of 'continental drift'?

Back

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Card 13

Front

Why did people not accept his theory?

Back

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Card 14

Front

What evidence was discovered in the 1960s?

Back

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Card 15

Front

What other evidence was discovered in the 1960s?

Back

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