3.
first 2 parts have already been discussed in the previous papers.

Non-renewable energy is energy, taken from "finite resources that will eventually dwindle, becoming too expensive or too environmentally damaging to retrieve", as opposed to renewable energy sources , which "are naturally replenished in a relatively short period of time."

Various types of coal are mined, such as anthracite, bituminous coal, and lignite.
Petroleum forms the basis for heating oil, diesel fuel, and gasoline.
Natural gas is commonly also referred to just as gas. It is mostly methane, and most of the additional material is removed before use as a fuel.
Nuclear energy fuel for fission is mined as Uranium ore.
Propane gas is used from manufacturing and heating and makes up 1.7% of the U.S.'s energy consumption.

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