Earth
What evidence tells scientists that some dinosaurs may have lived together in groups?
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How many miles long is an average bolt of lightning?
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What does granite become when put under heat and pressure?
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Approximately what fraction of the Earth's air is made up of oxygen?
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What are the pilots who guide ship captains to docking areas safely called?
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What is the natural process by which rocks break down into smaller chunks?
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What happens to the air pressure as we increase our altitude?
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Which material do fossils make more attractive to an architect?
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