Earth

What color was the dust that swept the Great Plains?

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What reef is the largest living structure on Earth?
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What mineral makes both sapphires and rubies when cut and polished?
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Al Gore made a film about what climate issue?
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What rock was used for navigation by the ancient Chinese people?
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What are minerals found in high quantities and worth mining called?
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What is the name for huge waves that are often caused by an underwater earthquake?
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Lightning struck what eight times in 24 minutes?
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What is the theory that describes how the continents got where they are today?
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