英语翻译What was the origin of the oil which now drives our moto

英语翻译
What was the origin of the oil which now drives our motor-cars and aircraft?Scientists are confident about the formation of coal,but they do not seem so sure when asked about oil.They think that the oil under the surface of the earth originated in the distant past,and was formed from living things in the sea.Countless billion of minute sea creatures and plants lived and sank to the sea bed.They were covered with huge deposits of mud,and by processes of chemistry,pressure and temperature,were changed through long ages into what we know as oil.For these creatures to become oil,it was necessary that they should be imprisoned between layers of rock for an enormous length of time.The statement that oil originated in the sea is confiremed by a glance at a map showing the chief oilfields of the world; very few of them are distant from the oceans of today.In some places gas and oil come up to the surface of the sea from its bed.The rocks in which oil is found are of marine origin too.They are sedimentary rocks,rocks which were laid down by the action of water on the bed of the ocean.Almost always the remains of shells,and other proofs of sea life,are found close to the soft rock and was obviously formed by being deposited on the sea bed.And where there is shale there is likely to be oil.

现在汽车飞机用的石油是从哪儿来的?科学家很确定煤的构成,可对石油就不那么确定了.他们认为地下的石油是很久以前的海洋生物声称的.亿万的海洋生物和植物存在并沉降到海床.他们被被巨大的泥浆沉积物覆盖,并在化学,压力和温度下变化.多年的改变形成了我们所知的石油.这些生物要变成石油,他们就需要被困于岩石层中非常久的时间.这个关于石油产生于海洋的声明确定于一份主要油田分布地图；很少油田是远离现今的海洋的.某些地区,天然气和石油从海床上升到表面.同时,发现石油的岩石以前也是在海中的.这些沉积岩由于海床水流形成的.那些剩下的贝壳,以及其他海洋声明的证明,也在软石的附近被发现,而且明显是在海床沉淀下形成的.另外,有页岩的地方就有石油.