Earth

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

More Questions from Earth
Which of the following is a natural resource?
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The bottom layer of the atmosphere is called what?
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How many continents does Earth have?
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Which of the following lakes has a higher salt content than normal?
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Which of these is not a metamorphic rock?
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What was TIROS I, launched on April 1, 1960?
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What is a Herkimer diamond?
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What is the name of a glacier that is formed when two or more valley glaciers flow together?
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