Earth
What type of energy sources can't be replaced readily within a 30-year span?
More Questions from Earth
What is the hard, dark substance found in the ground that is mined for fuel?
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What is the theory that describes how the continents got where they are today?
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What natural disaster is caused by earthquakes but could also be caused by an asteroid?
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What is the name of the limestone formation that rises from a cave floor?
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How much of an iceberg appears above the water line?
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What is the Hawaiian name for smooth-flowing basaltic lava, often appearing twisted and rope-like?
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