Fossil fuel is a term used to describe a group of energy sources that were formed when ancient plants and organisms were subject to intense heat and pressure over millions of years.
Coal is a combustible black or dark brown rock consisting of carbonized plant matter, found mainly in underground deposits and widely for electricity production.
Oil is a fossil fuel and liquid hydrocarbon used mainly for the production of transportation fuels and petroleum-based products.
Hydraulic fracturing is an oil and gas production technique used in tight geologic formations that involves horizontal directional drilling of wells as well as the use of water, sand and chemicals at high pressures to fracture rock and release hydrocarbons.
Nuclear energy is released from the nucleus of atoms through the processes of fission or fusion.
Other forms of energy:
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