Science

What is the hardest known natural material?

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Which of these is defined as "part of the electromagnetic spectrum that contains visible light"?
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What determines how loud or soft a sound is?
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Who was the space walking astronaut on Gemini 10?
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The path traveled by a body in space is known as what?
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First appearance of light in the eastern sky before sunrise best fits which term?
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What type of tissue makes up the femur?
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Which scientific term is defined as a physical particle with a negative charge?
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What is a giant crack in a rock called?
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