Earth

What mineral makes both sapphires and rubies when cut and polished?

More Questions from Earth
Which of these habitats is a dry one usually with sand and can sometimes be very hot?
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What is the name of the reddish soils of the humid tropics?
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What is the longest river in Europe?
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In weather terms, what turns to water in a "spring thaw"?
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What instrument indicates wind direction?
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What direction does a compass needle point to?
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Which country produces about 1/5 of the world's garbage per year?
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What is moving air called?
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