Earth
What is the most-spoken language in the world?
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What word is generally used to describe visible air pollution?
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The side of a sail furthest away from the wind is what?
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What is the sediment left behind after a glacier moves through an area called?
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Which of these landforms is an area of land lying between hills or mountains?
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What type of topography describes caves, caverns, and sinkholes?
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Who published the groundbreaking book "Principles of Geology" in 1830?
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