Earth
Approximately what fraction of the Earth's air is made up of oxygen?
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How cold does it need to be outside before it can snow?
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What country forms a 2000-mile archipelago along the east coast of Asia?
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Which pairs of minerals are almost always found together?
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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 are solids contained in the gas that issues from a volcano called?
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What percentage of known volcanoes are subaerial, meaning they erupt into the atmosphere?
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