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What is the greenhouse effect?
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Evolution
What is the jet stream?
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Evolution
What is the ozone layer?
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Evolution
Is the ozone layer being depleted?
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Evolution
How much of the ozone layer is being depleted?
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Evolution
How do CFCs destroy ozone?
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Evolution
Why is it very wet on one side of a mountain range?
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Evolution
What is a rain shadow?
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Evolution
