Earth

Which of the following minerals is the hardest?

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What might you find on the grass after a cool summer night?
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What are the pilots who guide ship captains to docking areas safely called?
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What does Earth do to cause night and day?
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What layer of the Earth's atmosphere contains the ozone layer?
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What kind of waves does an earthquake produce?
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What is another name for permanently frozen ground?
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Which material do fossils make more attractive to an architect?
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What energy does Earth give back to space?
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