It has in one part a spring of petroleum or rock oil, and one of its mountains is a volcano.
It can only be preserved in naphtha, rock oil, or some other fluid hydrocarbon.
A product of the fractional distillation of American rock oil.
From such processes the so-called hydrocarbons, rock oil and natural gas, have accumulated.
Holes are bored into the rocks, and the petroleum or rock oil is pumped into huge tanks.
Both Townsend and Drake would have died richer men had they never heard of the Pennsylvania rock oil.
Then came the great discovery of rock oil, which rapidly superseded the whale oil of commerce in general use.