Earth

What type of energy sources can't be replaced readily within a 30-year span?

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What permanent snowcap is within sight of the equator?
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What instrument measures water vapor in the atmosphere?
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Which of these types of energy is cleanest and causes the least pollution?
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Lightning struck what eight times in 24 minutes?
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What is the area filled with groundwater called?
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Which of the following minerals is the hardest?
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Mercurial barometers measure what?
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What rock was used for navigation by the ancient Chinese people?
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