Petroleum is a ______ energy source.

Petroleum forms from the remains of ______ and animals millions of years ago.

Where is most oil buried?

Natural gas floats to the surface of oil.

Scientists have found oil everywhere, except for which continent?

Which of the following countries is one of the top oil producers?

In the United States, ______ produces the most oil.

Permeable Rock is a rock that ______ like oil can flow through.

Oil that comes out of the ground is called _____

Oil is transported by tankers or by a _____

Before oil can be used, what must it go through?

Fill in the blank: One advantage is that it is relatively cheap because the systems for retrieving and distributing the oil have been _______ for a long time.

Burning oil contributes to ________.

Oil spills can cause severe ________ problems.