Earth
Approximately what fraction of the Earth's air is made up of oxygen?
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Which national park is directly west of the Painted Desert?
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What layer in the atmosphere is responsible for filtering out solar radiation?
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Mary Anning was the first to discover complete fossils of which prehistoric marine reptile?
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Which object is a remnant of a lightning bolt striking a sandy beach?
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What can help farmers control erosion in their fields?
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If an organic material is converted into stone, it becomes what?
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