Earth

Ruby and sapphire are gem forms of which mineral?

More Questions from Earth
What type of speleothems found in limestone caves grow upward from the floor?
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What is the nickname of Katmai in Alaska?
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What climate term is the opposite of humid?
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Approximately what fraction of the Earth's air is made up of oxygen?
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A weather proverb says "A year of snow," followed by what?
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Which of these is a spiral storm that can be many miles wide?
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What was the name of the August 2005 hurricane that damaged New Orleans?
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What is a sudden and heavy rainfall or downpour called?
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