Earth

What is the imaginary line that runs around the Earth halfway between the poles called?

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Red sky in morning, sailors take what?
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What front results when a cold front takes the area of a warm front?
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Where is most of the earth's gold located?
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What type of energy sources can't be replaced readily within a 30-year span?
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Which national park is directly west of the Painted Desert?
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How long does it take for the Earth to rotate around completely on its axis?
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What does the term "geocentric" mean?
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What piece of material attracts iron and some other metals?
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