Forest - a large area of land that is covered with trees, Fossil Fuel - fuel that contains carbon and that is formed in the Earth over millions of years from plant and animal remains; examples-oil and natural gas, Gasoline - a flammable liquid made of refined petroleum (oil) used for fuel engines, Natural - existing in or produced by nature- not made by people, Natural Gas - gas found underground and used as fuel, Protect - to prevent someone or something from being harmed, Rely - to depend upon; to count on, Renewable - able to be replaced naturally or by good management and so can be used without the risk of using up the whole stock, Resource - a supply of something, such as money or goods, that can be used by a person, Nonrenewable - not able to be reused or replaced,

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