Earth

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

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How many days does it take for the Earth to revolve around the sun?
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John Glenn first orbited the earth in what year?
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What is water that flows over the ground rather than seeping into it called?
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Which one of these is most alkali?
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Which is not a sedimentary rock?
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What makes Florida's Tampa Bay a unique aquatic environment?
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What is the federal weather agency in Canada called?
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78% of the earth's atmosphere is composed of which gas?
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