Science

What is the hardest known natural material?

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Which of these is not a Galilean satellite?
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Which is not one of the three states of matter?
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Which planet has visible rings around it?
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Who was the space walking astronaut on Gemini 10?
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How many years does it take for Mars to go around the Sun for a complete revolution in its orbit?
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What is the proper name for a "sundog", or an atmospheric optical phenomenon?
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What does the word "geothermal" mean?
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What fuels were formed from the decayed remains of plants and animals?
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