Earth

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

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What is another name for green beryl?
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Whose concept of erosion cycle dominated geology for 50 years after its release?
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How was the 12-mile limit of a country's boundary set?
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Which of these terms means "protecting and using a resource wisely"?
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What is the most common element in Earth's atmosphere?
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Which of the following types of trees does not have lobed leaves?
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When is Earth day every year?
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What is a front that does not advance called?
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