It comes from sunlight originally, since plants formed the original organic molecules.
When dead plants and animals were buried, compressed, and heated, their products (coal, oil, gas) retained the chemical energy stored in their molecules millions of years earlier.
Fossil fuels (coal, oil and natural gas) are a non renewable source of energy.
The energy source of fossil fuels comes from chemical bonds.
fossil fuels can be used as an energy source to power all vehicles and most machinery
Fossil fuels are exhaustible. Electric energy is an alternative.
Fossil fuels.
Fossil fuels are a non-renewable energy source.
fossil fuels
coal
Fossil fuels
wind is a renewable energy source ,while fossil fuels are nonrenewable .
they do but it can hurt the enviorment
Fossil fuels
The SUN!
Coal is a source of energy but i dontknow about all of them.