Fossil fuels refer to crude oil, coal and natural gas,which were created over
millions of years from the remains of dead animals and plants. As they take
so long to be made, they cannot be replenished, which is why they are
non-renewable. They are finite,which means we only have a limited supply
of them as well.
By burning the fossil fuels, we can use their energy for many different things:
electricity, heat, running cars etc.
Crude oil is a very thick liquid that human can extract from deep under- ground
by building a well. Once the crude oil is extracted, it is separated into lots of
different types of oil that it is made up of. These different oils can be used for
many things: some may be used as fuel in cars, boats and airplanes; others
may be used as camping gas. Initially, crude oil was created from the remain
of dead marine animals, which sunk to the bottom of the sea and were buried
under layers of sediment.