• Oil is a thick, dark brown or black liquid.
  • It is found in rock layers of Earth's crust.
  • Oil is currently the most commonly used source of energy in the world.
  • The United States produces only about one-quarter as much oil as it uses.
  • Petroleum is also used to make waxes, plastics, fertilizers, and other products.
  • The main oil producing regions in the U.S. are the Gulf of Mexico, Texas, Alaska, and California.
  • Oil moves through permeable rock and is trapped by the impermeable cap rock.
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