Oil and natural gas are fossil fuels. They formed from the remains of tiny plants and animals which one lived in tropical seas. They were changed by chemical processes into gases and liquids.
Oil and gas collect in porous rocks, which allow liquids to soak through. They are trapped between impervious rocks, which will not allow liquids to pas through. Some oil wells pump oil froma huge area, but other tap only a small area and soon run dry.
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