The natural gas that is found above oil-bearing rock is usually extracted along with oil so that it too can be used as a fuel. Natural gas is a simple molecule made up of four hydrogen atoms positioned around one atom of carbon; it consists mainly of a gas called methane. Most of the time, after natural gas is extracted, it is delivered through pipelines, and its end uses are mainly heating and generating electricity. To transport natural gas overseas, however, it is first chilled so that it liquefies, creating liquefied natural gas, or LNG, a source of energy that can be shipped easily.
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