Earth

What region surrounds the North Pole?

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What word means to degrade naturally?
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What kind of rain is bad for the environment?
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What mineral makes both sapphires and rubies when cut and polished?
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What is the ability of fluids to flow through soil called?
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What rock was used for navigation by the ancient Chinese people?
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What type of energy sources can't be replaced readily within a 30-year span?
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How much salt is in every gallon of seawater?
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