Earth
What is the most common element in Earth's atmosphere?
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How many days a year is the sun invisible at the North Pole?
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What is the only continent on Earth that does not have snakes?
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In terms of weather, what is the land corridor that stretches from Texas to North Dakota called?
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What soft brown coal that has lost all of its moisture called?
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What is the length, in miles, of the San Andreas Fault?
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What is an underwater boat with its own power and air supply called?
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What is the name given to a fossil that best defines a rock layer's age?
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What type of topography describes caves, caverns, and sinkholes?
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