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fossil fuels are fuels such as coal, oil, and natural gas that form from the remains of plants and other organisms coal is a rock that contains at least 50% plant remains oil is a thick, black liquid natural gas forms under similar conditions and often with oil reserve amount of fossil fuel that can be extracted at a profit using current technology nuclear energy is an alternate energy source produced from atomic reactions solar energy is energy from the Sun energy heats Earth wind farm large numbers of windmills are placed in one area for the purpose of generating electricity hydroelectic energy electricity powered by waterpower geothermal energy energy obtained by using hot magma or hot, dry rocks inside Earth biomass energy is energy derived from burning organic material such as wood, alcohol, and garbage mineral resource is a deposit of useful materials gangue waste rock that must be removed before a mineral can be used recycling is using old materials to make new ones