ANSWERS: 2
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It occurs naturally, as do all fossil fuels.
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I believe it is because it exist in gas form under ground. The liquid that comes out of natual gas wells is water. The gas has to be liquified during extraction for transport. It takes a lot of pressure to turn it into a liquid. Propane has similar properties, but is derived from Crude. I'm not an expert in this area, so if I'm wrong, please correct me.
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