Crude petroleum must be shipped to _____________ before it can be used.

Petroleum is shipped in

Most natural gas is transported through

Just about everyone in the United States uses natural gas.

The biggest users of natural gas in the U.S. is ___________-

Natural gas is used as "feedstock" an ingredient in _____________

Natural gas is cleaner burning than gasoline, but vehicles must have special equipment to use it.

At the refinery a process called fractional distillation is used to separate the molecules of petroleum based on their _________________.

a process called ______________ breaks hydrocarbon chains into smaller ones and is often used in further refining of gasoline and other fuels.

Currently the US imports ______% of of its crude oil supply

Which of the following are NOT factors in gasoline prices?