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4
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The energy released during nuclear fission or fusion, especially when used to generate electricity
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6
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Energy derived from the movement of water
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7
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Thermal energy generated and stored in the Earth
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8
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Renewable organic materials, such as wood, agricultural crops or wastes, and municipal wastes, especially when used as a source of fuel or energy
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9
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A supply of a commodity not need for immediate use but available is required
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12
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Any natural resource (as wood or solar energy) that can be replenished naturally with the passage of time
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13
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A natural fuel such as coal or gas, formed in the geological past from the remains of living organisms
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16
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Gases such as carbon dioxide, methane, nitrous oxide, water vapor, and ozone in the atmosphere which are involved in the greenhouse effect
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17
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A nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy
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1
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An area of land with a group of energy-producing windmills or wind turbines
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2
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Radiant energy emitted by the sun
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3
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An industrial installation where a substance is refined
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4
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A resource that cannot be reused or replaced
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5
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A viscous liquid derived from petroleum, especially for use as a fuel or lubricant
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10
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A combustible black or dark brown rock consisting mainly of carbonized plant matter, found mainly in underground deposits and widely used as fuel
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11
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A liquid mixture of hydrocarbons that is present in certain rock strata and can be extracted and refined to produce fuels including gasoline, kerosene, and diesel oil; oil
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14
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Flammable gas, consisting largely of methane and other hydrocarbons, occurring naturally underground (often in association with petroleum) and used as fuel
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15
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The energy recovery process of utilizing energy that would normally be wasted, usually by converting it into electricity or thermal energy
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