Earth
What is the estimate of the true age of a mineral or rock called?
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In the United States, in which month does spring begin?
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What was the Great Plains of the U.S. called in the 1930's because of erosion?
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What is the term for when pieces of glaciers break off and form icebergs?
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What is the term used to classify igneous rocks that are light in both color and gravity?
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What type of topography describes caves, caverns, and sinkholes?
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