Coal Natural Gas Oil Nuclear Energy Oil Oil is a liquid that formed underground when ancient plants and animals decomposed under layers of earth. Oil moved through cracks and pores in the rock. It collected millions of years ago in pockets and folds of rock, where we find it today.
Oil is a complex mixture of different compounds.
The other fossil fuel is coal. In Canada, the first oil well was drilled in southern Ontario. Larger amounts of oil are found in western Canada. Alberta has the most oil. Oil is also found in Saskatchewan, Manitoba and British Columbia.