Earth

Which scale is used to describe a mineral's hardness?

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What are minerals found in high quantities and worth mining called?
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What imaginary line divides the Earth's northern and southern hemispheres?
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What are the fastest and strongest global winds called?
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What is the area filled with groundwater called?
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What famed rock is 1396 feet high, 2.75 miles long, and .25 miles wide?
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What substance can layers of decayed plants form over time?
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What is the only continent on Earth that does not have snakes?
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What cloud has a flat, sheetlike appearance?
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