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Card 6

Front

What causes volcanoes and Earthquakes?

Back

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Card 7

Front

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

Back

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Card 8

Front

How is the Earth's structure studied?

Back

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Card 9

Front

What are the two types of seismic waves? Describe them

Back

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Card 10

Front

Which waves cannot travel through liquid?

Back

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Card 11

Front

How was this information used to prove the outer core is liquid?

Back

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Card 12

Front

Who was the first scientist to suggest continental drift?

Back

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Card 13

Front

Briefly describe his theory

Back

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Card 14

Front

What evidence suggested that Wegener was right?

Back

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Card 15

Front

Why was his theory not accepted initially?

Back

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