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Alternative Fuels

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Across
3
flammable gas, occurring naturally underground and used as fuel
5
energy for from heat found deep inside the Earth’s surface
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greasy, usually liquid substances from plant, animal, or mineral sources that do not dissolve in water and are used especially as lubricants, fuels, and food
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natural resources that are used up at a rate faster than they can be replaced
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energy from the Sun in the form of heat and light
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energy generated for heat and electricity using the power of falling water or water moving through a dam
Down
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energy resources useful to man that are considered alternatives or supplements to nonrenewable resources such as coal, oil, or natural gas
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energy generated from the movement of air
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formed from decayed plants and animals that have been converted to oil, coal, natural gas, by exposure to heat and pressure in the earth's crust over hundreds of millions of years.
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heat, pressure, and time formed from plants that died and decayed in swamps millions of years ago under layers of sediments
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energy generated through the processing of renewable plant and animal materials