Earth

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

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Which of these rivers is most likely a glacial boundary river?
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What type of energy sources can't be replaced readily within a 30-year span?
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What is the place where an air mass forms called?
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What arc is created by refraction and light?
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Which of the following is a nonrenewable resource?
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What is the transport of top layers of soil to another place called?
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What basic cloud formation resembles cauliflower?
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How are pockets of air in soil made?
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