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当你来到祖国名川大山做地质考察时,你一定会对自然界各种各样的岩石发生浓厚的兴趣。然而,要想一下子知道地壳都是由哪些岩石组成的以及岩石都是由哪些矿物组成的是不可能的。下面仅介绍一些同三大类岩石有关的资料,供地学爱好者和参加地学夏令营的同学们观察和了解岩石时参考。岩石的分类是在十九世纪后期(1862年),按成因不同将岩石划分出火成岩、沉积岩及变质岩三大类。这三大类岩石,火成岩较多,占地壳总重量的65%;变质岩占27%;沉积岩占8%。但在全球的大陆上,沉积岩覆盖了陆地面积的75%,
When you come to the motherland to do a geological survey of mountains, you will certainly have a strong interest in a variety of rocks in nature. However, it is not possible to know exactly which rocks the crust is made of and which minerals the rocks are made of. The following is a brief introduction of some of the three types of rock-related information for the geosciences enthusiasts and students attending geosciences summer camp observation and understanding of rock reference. Rock classification is in the late nineteenth century (1862), according to different causes of the rock is divided into igneous rocks, sedimentary rocks and metamorphic rock three categories. The three major types of rock, igneous more, accounting for 65% of the total weight of the crust; metamorphic rocks account for 27%; sedimentary rocks account for 8%. However, in the world’s continents, sedimentary rocks cover 75% of the land area,