Earth

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

More Questions from Earth
Al Gore made a film about what climate issue?
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How many geysers is Yellowstone National Park home to?
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What is the weather phenomenon known as a "tsunami"?
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Which of these is a warm spell of weather when ice and snow melt?
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What front results when a cold front takes the area of a warm front?
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What type of topography describes caves, caverns, and sinkholes?
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Which scale is used to describe a mineral's hardness?
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What are the fastest and strongest global winds called?
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