Earth

Which of the following minerals is the hardest?

More Questions from Earth
78% of the earth's atmosphere is composed of which gas?
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What causes the sound in a seashell?
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Slush is a combination of what with snow?
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Which of the following does not form mineral crystals?
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Who first charted the Gulf Stream?
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What is mining near the Earth's surface called?
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What is the transport of top layers of soil to another place called?
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What does your body use to get rid of salt?
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