Earth

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

More Questions from Earth
Fluids with a high viscosity resist what?
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Lightning struck what eight times in 24 minutes?
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What is a worldwide increase in temperature called?
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How was the 12-mile limit of a country's boundary set?
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Approximately what fraction of the Earth's air is made up of oxygen?
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What is the name of the reddish soils of the humid tropics?
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Which of these landforms is an area of land lying between hills or mountains?
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What is the very bottom soil horizon called?
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