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Earth
What mineral makes both sapphires and rubies when cut and polished?
Earth
What mineral makes both sapphires and rubies when cut and polished?
Apatite
Fluorite
Topaz
Corundum
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Which of the following lakes has a higher salt content than normal?
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What word means "the shakes that come after the earthquakes"?
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78% of the earth's atmosphere is composed of which gas?
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What is a sudden and heavy rainfall or downpour called?
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What is the term for the Earth's crust where it underlies oceans?
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What is the process that removes salt from sea water?
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Which national park is directly west of the Painted Desert?
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What name is given to 23.5 degrees north latitude?
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