Earth

What is the estimate of the true age of a mineral or rock called?

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How long does it take for the Earth to rotate around completely on its axis?
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In weather, "mean" means what?
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What causes the sound in a seashell?
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What name is given to 23.5 degrees north latitude?
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What is the name for a 100 foot tall tidal wave?
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Which of these is the Greek name for the east wind?
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