fuel, a material that releases energy as heat when it burns, combustion, process of burning a fuel to produce heat and light, turbine, a device that spins as energy converts from heat to kinetic, battery, stores chemical energy and converts it into electrical energy, fossil fuels, materials that formed as ancient plants and animals decayed underground, petroleum, liquid fossil fuel formed by the decay of plants and animals, natural gas, fossil fuel that occurs in the gas state, geothermal energy, heat energy obtained from beneath Earth's surface, hydropower, using the energy of moving water , emissions, release of harmful substances into the environment, pollutant , harmful substance, greenhouse gas, pollutant that increases the atmosphere's ability to hold heat.

Topic 7

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