Earth
Which pairs of minerals are almost always found together?
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What produces more energy than all the world's nuclear weapons combined?
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What activity allows humans to go underwater with oxygen tanks and a wetsuit?
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In weather terms, what turns to water in a "spring thaw"?
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Where in Arizona is the sun blocked 10% of the time?
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What rock was used for navigation by the ancient Chinese people?
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What is the imaginary line that runs from the North to the South Pole called?
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What type of rock forms from melted rock and comes to the surface to harden?
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