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我们知道地下有很多宝藏,有很多有用的矿产;如金、铜、铁、煤等。它们都是固体。但有两种重要的地下资源,是可以流动的液体与气体。从这两种地下资源里,可以炼出或造成开飞机、汽车与拖拉机的汽油,点灯的煤油与蜡烛,铺路的柏油,造轮胎的炭黑等。这两种资源的名字就叫石油与天然气。石油是一种黑褐色或黄褐色的液体。闻之有煤油味,燃之起火,浮在水面上呈五彩花纹。石油从地下流到地面後,经长期的挥发与氧化,便变成固体。黑色的固体叫瀝青,黄褐色的叫石蜡。都遇热即熔,见火即燃。天燃气可说是气体状的石油,四川自流井熬盐的火井,就是天然气点燃的。
We know that there are many treasures underground and there are many useful minerals such as gold, copper, iron and coal. They are all solids. But there are two important types of underground resources that are liquids and gases that can flow. From these two kinds of underground resources, you can refine or create gasoline for airplanes, cars and tractors, kerosene and candles for lighting, asphalt for paving, and carbon black for tires. The names of these two resources are called oil and gas. Oil is a dark brown or tan liquid. The smell of kerosene smells, and it burns and catches fire. It floats on the water and shows a colorful pattern. After flowing from the ground to the ground, oil becomes solid after long-term volatilization and oxidation. The black solid is called asphalt and the tan is called paraffin. It is melted when it meets heat. Natural gas can be said to be gas-like oil, and the wells of the Ziliu Salt in Sichuan are ignited by natural gas.