Earth

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

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What arc is created by refraction and light?
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What substance can layers of decayed plants form over time?
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How many continents does Earth have?
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What type of boundary is made by the Mariana Trench?
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What energy does Earth give back to space?
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A weather proverb says "A year of snow," followed by what?
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What does granite become when put under heat and pressure?
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What does the Saffir-Simpson scale measure?
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