Earth
What is the most common element in Earth's atmosphere?
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What is water that flows over the ground rather than seeping into it called?
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What is the most photographed, painted, and scaled mountain in the world?
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What are the pilots who guide ship captains to docking areas safely called?
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What happens to the air pressure as we increase our altitude?
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What instrument measures water vapor in the atmosphere?
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What activity allows humans to go underwater with oxygen tanks and a wetsuit?
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Which of these terms means "protecting and using a resource wisely"?
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