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Study
our changing planet
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What is it?
It's a valley
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What is it?
It's a volcano
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What is it?
It's a mountain
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What is it?
It's a lake
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What is it?
It's river
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What is it?
It's a forest
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What is it
it's a desert
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What are they?
They're hills
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How old is the earth?
4.5 billion
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