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天然气是埋藏在地下的一种气体。有的蘊藏在不含石油的岩层中,有的和石油存在一起。据研究,它的成因是由于几万万年以前地壳的造山运动和海底的火山噴友等原因,将陆地和海洋里的許多动植物深
Natural gas is a gas buried underground. Some are contained in oil-free rock formations, and some exist together with oil. According to the study, the cause of this is the fact that many animals and plants in the land and in the sea were deep because of the tectonic movement of the earth’s crust ten thousand years ago and the volcanic spray on the seabed.