Biomass - Material coming from living things, Coal - A hard, black solid formed from remains of plants over millions of years old. Nonrenewable, Energy - Ability of a system to do work, Energy Resource - Source of supply to generate electric power, Fossil Fuel - A natural, nonrenewable resource such as coal, oil or natural gas. All come formed from remains of living things millions of years ago, Geothermal energy - Heat from beneath earth's surface used to produce energy, Greenhouse gasses - Gases in earth's atmosphere trap heat, Hydropower - Energy based on the movement of water. Renewable, Landfill - disposal site for solid waste, Natural Gas - A gas found in the ground in petroleum. It is burned for energy. Nonrenewable , Non-renewable - Not replaceable in short time, Nuclear Power - Energy from the decay of uranium atoms, Petroleum Oil - Yellow to black liquid beneath earth's surface. Nonrenewable, Pollution - Harmful materials in the environment, Renewable - Replaceable in short period of time, Solar Power - Energy collected from the sun. Renewable, Wind Energy - Energy from movement of air. Renewable,

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