Earth

What rock was used for navigation by the ancient Chinese people?

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What family are both poison oak and poison ivy part of?
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What percentage of rock-forming minerals are silicates?
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What is the imaginary line that runs around the Earth halfway between the poles called?
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What produces more energy than all the world's nuclear weapons combined?
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What is the best definition of the term "rock"?
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What is the estimate of the true age of a mineral or rock called?
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Which word means to "filter down through the soil horizons"?
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What is the current era in the geologic time scale?
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