Earth

Ruby and sapphire are gem forms of which mineral?

More Questions from Earth
What evidence tells scientists that some dinosaurs may have lived together in groups?
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Al Gore made a film about what climate issue?
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A clear sky contains very few what?
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Which of the following is magnetic?
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What fuel comes from the remains of 300-million-year-old decayed fern plants?
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Which of these planets is smaller than Earth?
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What does a konimeter measure?
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A weather proverb says "A year of snow," followed by what?
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