Earth
What rock was used for navigation by the ancient Chinese people?
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What type of speleothems found in limestone caves grow upward from the floor?
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What layer of the Earth's atmosphere contains the ozone layer?
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What type of fossils give only evidence of activities of past living creatures?
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What is the current era in the geologic time scale?
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What is the system consisting of the Earth's sun and the eight planets orbiting it called?
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