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What is the hardest known natural material?
Science
What is the hardest known natural material?
Diamond
Carbon
Iron
Mercury
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Marie Curie spent much time studying which of these subjects?
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The Sun's mass is approximately how many times as great as Earth's?
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What is the study of stars, planets and galaxies called?
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What process refers to the joining of pollen with an ovule to form a seed?
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