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煤是埋藏在大地之下的宝藏,地质学家称之为乌金,赋存量大,不但可燃,还可以从中提炼出许多有机物质。从古生代至第四纪地层中都赋存有煤层,最丰富应属于石炭纪、二叠纪、侏罗纪和第三纪。上述四个地质时期,在我国曾形成过大型湖泊、沼泽区,区域内有高大的古代植物。当地壳变迁,湖泊和古植物被迅速埋盖与外界隔绝断氧,又经过漫长的地质作用而形成了现在的煤层。煤的形成为两大类。一类为腐质煤,其质光亮,重量较轻,燃烧无烟。它的成因是由浅至深湖水中生
Coal is buried in the earth under the treasure, geologists call it black metal, large amount of stock, not only combustible, but also extract a lot of organic matter. From the Paleozoic to Quaternary strata all exist in the coal seam, the most abundant belong to the Carboniferous, Permian, Jurassic and Tertiary. In the four geological periods mentioned above, large lakes and swamp areas have been formed in our country and tall ancient plants are in the area. As the earth’s crust changes, lakes and ancient plants are quickly buried to isolate oxygen from the outside world and form the present coal seam through long geological processes. The formation of coal into two categories. A class of humic coal, the quality of light, light weight, burning smoke-free. Its cause is from shallow to deep lake students