变化的主体—地壳—岩石我们到山上或野外去,可以看到各种各样的岩石:有的是灰的,有的是黑的,有的是黄的,有的是红的……;有的很坚硬,有的很松软;有的内部颗粒很细小,有的很粗大;有的成块状,有的成薄层状;……但不管它们的性质和形状怎样不同,我们都可以根据它们的生成原因,把它们分成三大类,即火成岩、沉积岩和变质岩。大家知道,青岛的花岗岩是很好的建筑材料。其实,花岗岩很普通,许多名山,如皖南的九华山、黄山,陕西的华山,都是主要由它组成的。花岗岩就是一种火成岩,它是由地球内部的炽热岩浆,在侵入地壳裂隙,或喷出地面 The main body of change - the earth’s crust - rocks. We can go to the mountains or the fields. We can see all sorts of rocks: some are gray, some are black, some are yellow, some are red... Some are very hard, some are very Soft; some internal particles are very small, some are very large; some into a block, some into a thin layer; ... but no matter how their nature and shape are different, we can according to their causes, put them Divided into three categories, namely igneous rocks, sedimentary rocks and metamorphic rocks. As we all know, Qingdao’s granite is a good building material. In fact, granite is very common. Many famous mountains, such as Jiuhua Mountain in Huangnan, Huangshan Mountain and Huashan Mountain in Shaanxi, are mainly composed of it. Granite is a type of igneous rock. It is a hot magma in the interior of the earth. It penetrates into cracks in the earth’s crust or ejects the ground.