Earth
What is the hardest mineral known on Earth called?
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What soft brown coal that has lost all of its moisture called?
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What is the term for when pieces of glaciers break off and form icebergs?
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Which scale is used to describe a mineral's hardness?
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Which of these rivers is most likely a glacial boundary river?
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About what percentage of solar radiation is absorbed by Earth's atmosphere, oceans and land masses?
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What type of boundary is displayed at the Mid-Atlantic Ridge?
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Which national park is directly west of the Painted Desert?
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