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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
Chrysoberyl
Chalcedony
Corundum
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What must happen for a tree to become a fossil?
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Which of the following lakes has a higher salt content than normal?
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Which of the following items is a tool used to tell time by the sun's movement in the sky?
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What is the name of the single continent that existed early in Earth's history?
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Where would you find the abyssal plain?
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What is the very bottom soil horizon called?
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What basic cloud formation resembles cauliflower?
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Where is the coldest place on earth?
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