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Nonrenewable energy sources come out of the ground as liquids, gases and
solids. Right now, crude oil (petroleum) is the
only naturally liquid commercial fossil fuel. Natural
gas and propane are normally gases,
and coal is a solid. Coal, petroleum, natural
gas, and propane are all considered fossil fuels because they formed from the
buried remains of plants and animals that lived millions of years ago.
Uranium ore, a solid, is mined and converted
to a fuel. Uranium is not a fossil fuel. These energy sources
are considered nonrenewable because they can not be replenished (made again)
in a short period of time. Renewable energy sources can be replenished
naturally in a short period of time.
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