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What is the hardest known natural material?

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How many days was Skylab III in space?
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A covering of ice crystals on the ground is known as what?
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What cellular structure found in the nucleus helps in protein formation?
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In which year was Hubble's Law formulated?
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Which scientist disproved the Spontaneous Generation Theory?
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What is water in its solid form called?
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Which of the following is a type of cloud?
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What does a seismologist study?
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