It's because they take millions of years to form - but we're using them up far much faster than they can be created.
All fossil fuels used for energy are being used up faster than they can be replaced- they were formed over many millions of yearsme
fossil fuels
Alternative energy usually means any energy source other than fossil fuels. That includes solar energy, wind power, and geothermal energy.
Nuclear power plants and fossil fuels such as petroleum.
Fossil fuels
Oil
fossil fuels can be used as an energy source to power all vehicles and most machinery
Nuclear energy that is the source of sun energy which in turn is the source of fossil and renewable energies.
Chemical energy
No it is its own source of energy
Fossil fuels.
Fossil fuels are exhaustible. Electric energy is an alternative.
Currently, human's conventional source of energy is fossil fuel.
Petroleum is the main source of energy for transportation.
nuclear power,fossil energy and alternative energy.
Fossil fuels (coal, oil and natural gas) are a non renewable source of energy.
Fossil fuels