Earth

What is the hardest mineral known on Earth called?

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What is the name of the galaxy in which the Earth exists?
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What are mounds of sand that have been windblown called?
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What evidence tells scientists that some dinosaurs may have lived together in groups?
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There are over one quadrillion of what animal on Earth?
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Where would you take cover from a tornado?
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Which volcano in Iceland was once thought to be a gateway to the underworld?
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What kind of scientist studies weather and climate?
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In what direction does the sun set for people on Earth?
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