Earth

What is the name of the single continent that existed early in Earth's history?

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What type of topography describes caves, caverns, and sinkholes?
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What climate term is the opposite of humid?
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What are the rocks that glaciers carry with them to far places called?
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What soft brown coal that has lost all of its moisture called?
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What is a sudden and heavy rainfall or downpour called?
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What do the Japanese call a hurricane?
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How much salt is in every gallon of seawater?
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