Crude oil is removed from the earth through [drilling / underground pipes / barges / mining / separated / extracted]. it is then [drilling / underground pipes / barges / mining / separated / extracted] into its different components by heating and boiling. after this step, gasoline is processed and delivered to central terminals via [drilling / underground pipes / barges / mining / separated / extracted].

Crude oil is removed from the earth through drilling. It is then extracted into its different components by heating and boiling. After this step, gasoline is processed and delivered to central terminals via underground pipes.