More cards in this set

Card 6

Front

When did the Earth form?

Back

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Card 7

Front

What were the first elements?

Back

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Card 8

Front

When was the Solar System formed?

Back

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Card 9

Front

What is the core of the Earth made of?

Back

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Card 10

Front

What is the outer core of the Earth made of?

Back

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Card 11

Front

What is the inner core of the Earth made of?

Back

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Card 12

Front

How thick is the outer core?

Back

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Card 13

Front

How thick is the inner core?

Back

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