Earth
What reef is the largest living structure on Earth?
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What is the highest mountain, considering just the contiguous United States?
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What type of glacier is Greenland or Antarctica called?
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The Earth's atmosphere lies just above what part of its composition?
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What was the nationality of the scientist who demonstrated a heliocentric system?
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Which national park is directly west of the Painted Desert?
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What two countries lie on opposite sides of the Juan de Fuca Strait?
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