Earth

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

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How was the 12-mile limit of a country's boundary set?
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What are the rocks that glaciers carry with them to far places called?
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What type of satellites are always in the same spot in Earth's orbit?
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Which one of these is most alkali?
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What disaster is a combo of downdrafts and updrafts?
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In what month does a "Milk Moon" occur?
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What name is given to 23.5 degrees north latitude?
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What permanent snowcap is within sight of the equator?
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