Earth
Ruby and sapphire are gem forms of which mineral?
More Questions from Earth
What is a person called who specializes in the physical structure and process of the earth?
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Which of these types of pollution occurs naturally?
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Which is the largest planet in Earth's solar system?
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How many geysers is Yellowstone National Park home to?
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What is the name of the single continent that existed early in Earth's history?
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What product of burning fossil fuels can cause death by preventing oxygen from getting to cells?
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