Earth

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

More Questions from Earth
Which of these terms can be used to describe steam?
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What is the term for the Earth's crust where it underlies oceans?
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What must fossilize in order to form a coprolite?
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What is the hard, dark substance found in the ground that is mined for fuel?
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Which object is a remnant of a lightning bolt striking a sandy beach?
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What forms when water condenses in the Earth's atmosphere?
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What is the theory that describes how the continents got where they are today?
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In weather, "mean" means what?
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