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| a substance that provides energy as the result of a chemical change |
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| a change from one form of energy to another |
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| the process of burning a fuel |
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| an energy-rich substance (such as coal, oil, or natural gas) formed from the remains of organisms |
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| electricity produced using the energy of the flowing water |
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| fuel made from living things |
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| heat from Earth's interior |
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| the central core of an atom that contains the protons and neutrons |
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| the splitting of an atom's nucleus into two smaller nuclei and neutrons |
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| the combining of two atomic nuclei to produce a single larger nucleus and much energy |
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| the percentage of energy that is used to perform work |
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| material that blocks heat transfer between the air inside and outside a building |
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| the practice of reducing energy use |
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