Earth
What is an underwater boat with its own power and air supply called?
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What layer in the atmosphere is responsible for filtering out solar radiation?
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What is water that flows over the ground rather than seeping into it called?
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In the United States, in which month does spring begin?
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In what modern-day country did the dog called the Rhodesian Ridgeback originate?
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Which of these continents would you find in the southern, western hemisphere?
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