Oil, coal, natural gas or other petroleum-based resources are called fossil fuels because they are formed by the decayed remains of prehistoric plants and animals.
(Oil, coal, natural gas or other petroleum-based resources; are called; fossil fuels; because they are formed by the decayed remains of prehistoric plants and animals) (they; are formed; by the decayed remains of prehistoric plants and animals)
Oil, coal, natural gas or other petroleum-based resources they
are called are formed
fossil fuels because they are formed by the decayed remains of prehistoric plants and animals
by the decayed remains of prehistoric plants and animals