Earth

Ruby and sapphire are gem forms of which mineral?

More Questions from Earth
What is a downburst covering an area smaller than 2.5 miles in diameter called?
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What is the name for huge waves that are often caused by an underwater earthquake?
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What is the name for a 100 foot tall tidal wave?
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John Glenn first orbited the earth in what year?
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Who published the book "The Theory of the Earth" in 1795?
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What does a konimeter measure?
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What is the very bottom soil horizon called?
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What activity allows humans to go underwater with oxygen tanks and a wetsuit?
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