Earth

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

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Slush is a combination of what with snow?
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When a meander is cut off, what is formed?
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What is the process that removes salt from sea water?
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What is the name of the limestone formation that rises from a cave floor?
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Where would you take cover from a tornado?
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What is the Hawaiian name for smooth-flowing basaltic lava, often appearing twisted and rope-like?
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What are the three main categories of rock?
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Who issues severe weather advisories in the U.S.?
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