Earth

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

More Questions from Earth
What type of energy sources can't be replaced readily within a 30-year span?
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Al Gore made a film about what climate issue?
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What must happen for a tree to become a fossil?
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What type of satellites are always in the same spot in Earth's orbit?
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What is the tendency of Earth's rotation to turn winds called?
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Where is most of the earth's gold located?
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Which of these types of pollution occurs naturally?
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What event happened when water droplets were on a spider's web but it hadn't rained?
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