Science
What is the hardest known natural material?
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The definition of "clouds composed of small particles, mostly ice crystals" best fits which science term?
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What is water stored beneath the surface of the Earth called?
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Which abbreviation refers to a term that literally means "below red"?
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What would you use to measure the mass difference between two like objects?
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A very fast white water cascade is also known as what?
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What liquid is used as a standard when measuring density?
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Which term describes flying at six times the speed of sound?
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