Earth

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

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What type of radar measures radial velocity?
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From what perspective does a map shows what the earth looks like?
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What is a Herkimer diamond?
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In what month does a "Milk Moon" occur?
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What front results when a cold front takes the area of a warm front?
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Broken river ice stuck in a narrow channel causes what?
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What is a region of Earth in which all areas share the same time called?
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What is a worldwide increase in temperature called?
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