Earth

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

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Which of these is the Greek name for the east wind?
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What type of radar measures radial velocity?
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How many continents does Earth have?
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What is the length, in miles, of the San Andreas Fault?
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Where is the deepest land gorge on Earth?
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What is a meteoroid called if it lands on the Earth's surface?
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Abnormally warm weather in autumn is called what?
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What forms when water condenses in the Earth's atmosphere?
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