What is a thick, dark brown or black liquid found in rock layers of the earth's crust?

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asked Jan 6 in Science by TamelaHollim (490 points)

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answered Jan 6 by LasonyaMarro (310 points)

oil

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.

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What is a thick, dark brown or black liquid found in rock layers of the earth's crust?

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