Explain the reason why Coal and Petroleum are called Fossil Fuels?

Fossil Fuel sources are gotten from fossils that were framed great many years prior. They are fossilized natural remaining parts that more than a large number of years have been changed over to oil, gas, and coal. These energizes are comprised of decayed plant and creature matter. The dead and disintegrated were covered under the earth for a long time, the dead and rotting matter under a lot of weight and temperature changed into fossils. Components present in petroleum products notwithstanding carbon are hydrogen, nitrogen and sulphur.