What oil shale is not the same as coal, oil shale, the volume of the element. The ash is very high. It is not popular to burn as fuel directly. But oil is refined into more
What rocks do not oil the same as coal is a rock that contains a quantity of oil and ash is very high and thus not be burnt as fuel directly, but it is more than oil refining.
It is not the same as the stone coal, oil, natural gas has a volume of iron deficiency anemia, and very high ash, it is not the most popular, and burned as a fuel, but it is the oil distilled from more than