Earth

What is another name for permanently frozen ground?

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What is the name of a representation of the Earth on a piece of paper?
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What are mounds of sand that have been windblown called?
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Who first charted the Gulf Stream?
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Confluence is the opposite of what?
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On which canal would a traveler find Port Said?
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What is the calm center part of a hurricane called?
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Where is the deepest land gorge on Earth?
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What is a seven-letter word meaning "movement of weathered material from gravity"?
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