Earth
What is the estimate of the true age of a mineral or rock called?
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Which of these types of energy is cleanest and causes the least pollution?
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What is a sudden and heavy rainfall or downpour called?
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Which is the largest planet in Earth's solar system?
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In weather terms, what does the Fujita scale classify?
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From which does the Global Positioning System receive its information?
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What evidence tells scientists that some dinosaurs may have lived together in groups?
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What type of power did the ancient Persians use to grind grains?
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