NON-RENEWABLE  ENERGY.

COAL .
Is a combustible black or brownish-black sedimentary rock composed mostly of carbon and hydrocarbons. 

PETROLEUM (CRUDE OIL)

Crude oil is usually found in underground areas called reservoirs. It is liquid in nature and yellowish black in color. They  composed mainly ofhydrocarbons and organic compouns.They are usually discovered by oil prospecting scientists.
NATURAL GAS.

Natural Gas is colorless, shapeless, and odorless in its pure form. Unlike others fossil fuels , natural gas is clean burning and emits lower levels of potentially harmful by products into the air . It is therefore called "clean gas"
PROPANE

Propane is an energy-rich gas . It is chemical formula is C3H8.
It is one of the liquefied pretoleum gases (LPGs) that are found mixed with natural gas and oil.               

NUCLEAR

Nuclear energy is energy in the nucleud (core) of an atom .Atoms are tiny particles that make up every object in the universe. There is enormous energy un the bonds that hold átomos together.