Earth

What is the test that can help determine the hardness of a rock called?

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Broken river ice stuck in a narrow channel causes what?
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Who published the book "The Theory of the Earth" in 1795?
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The "Bergeron process" deals with what kind of precipitation?
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Where is the deepest land gorge on Earth?
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What are the traces of animals and plants left in rocks called?
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What does the term "geocentric" mean?
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What soft brown coal that has lost all of its moisture called?
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Which of these habitats describes the North Pole?
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