Liquid fossil fuels, like petroleum , is formed in areas that geologists believe were once covered by oceans or seas.
(Liquid fossil fuels; is formed; L:in areas) (geologists; believe; ) (areas that geologists believe; were covered; by oceans or seas; T:once)
Liquid fossil fuels geologists areas that geologists believe
is formed believe were covered
L:in areas
by oceans or seas T:once