OIL!
in its early stages this fossil fuel is a spongy brown material
this fossil fuel provides about 40% of the worlds energy
OIL!
coal
natural gas
No use of ANY fossil fuel can be regarded as conserving resources.
Yes it is a fossil fuel.
No its not a fossil fuel
Uranium is not a fossil fuel and cannot be a fossil fuel.
Oil is a fossil fuel.
a living fossil fuel.