Earth
What is the very sticky form of clay till called?
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What type of power did the ancient Persians use to grind grains?
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What rock was used for navigation by the ancient Chinese people?
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What branch of science deals with fossils of living things?
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What is the transport of top layers of soil to another place called?
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What is the name for huge waves that are often caused by an underwater earthquake?
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What type of fossils give only evidence of activities of past living creatures?
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A weather proverb says: "Clear moon," followed by what?
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