Earth

What is the main cause of caves?

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What kind of scientist studies weather and climate?
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Which family does the herb angelica come from?
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What is the federal weather agency in Canada called?
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Which age is known as the "Age of Fish"?
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What is another name for an estuary?
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What is the imaginary line that runs around the Earth halfway between the poles called?
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What is the hottest place on earth?
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What mineral makes both sapphires and rubies when cut and polished?
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