Earth

Which of the following minerals is the hardest?

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Where is the deepest land gorge on Earth?
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What is another name for permanently frozen ground?
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Red sky in morning, sailors take what?
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What is a person called who specializes in the physical structure and process of the earth?
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Which word means to "filter down through the soil horizons"?
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What piece of material attracts iron and some other metals?
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What are the fastest and strongest global winds called?
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Where would you take cover from a tornado?
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