Earth

How many days a year is the sun invisible at the North Pole?

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What storm is the opposite of an anticyclone?
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What is the release of water vapor from plants called?
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In weather terms, what is the opposite of heat?
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What direction does a compass needle point to?
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Rapidly descending air beneath a thunderstorm is what?
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What is the most photographed, painted, and scaled mountain in the world?
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What are the three main categories of rock?
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Where is an earthquake's epicenter?
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