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Earth
Ruby and sapphire are gem forms of which mineral?
Earth
Ruby and sapphire are gem forms of which mineral?
Chrysoprase
Chalcedony
Chrysoberyl
Corundum
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John Glenn first orbited the earth in what year?
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Which star is the closest one to Earth?
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What is sedimentary rock composed primarily of sand-sized grains?
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What percentage of rock-forming minerals are silicates?
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The average rain drop falls at a rate of how many feet per second?
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What is the highest mountain, considering just the contiguous United States?
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What is the natural process by which rocks break down into smaller chunks?
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A weather proverb says "A year of snow," followed by what?
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