Earth

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

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In the U.S., the spring equinox occurs in what month?
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What is the release of water vapor from plants called?
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What is the most common element in Earth's atmosphere?
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What imaginary line divides the Earth's northern and southern hemispheres?
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The Earth's atmosphere lies just above what part of its composition?
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Which of these is not a type of coral-reef shoreline?
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What is the theory that describes how the continents got where they are today?
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A 286-mph tornado ripped through what U.S. state?
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