Earth

What is the area filled with groundwater called?

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What happens to the air pressure as we increase our altitude?
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A 286-mph tornado ripped through what U.S. state?
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What did ancient farmers probably use to tell the passing of seasons?
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What type of clouds surround the eye of a hurricane?
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What is an underwater boat with its own power and air supply called?
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What is another name for layers of rock?
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What is the top layer of the soil called?
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What imaginary line divides the Earth's northern and southern hemispheres?
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