Earth
What is the test that can help determine the hardness of a rock called?
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What hurricane demolished Homestead, Florida, in 2002?
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Whose calculation of the size of the earth's diameter was almost exact?
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What process carries minerals down into lower soil horizons?
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What is the estimate of the true age of a mineral or rock called?
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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 type of glaciers fill up the gaps between mountains?
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Which type of irrigation is most commonly used throughout the world?
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In the United States, summer officially begins in which month?
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