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诞生初期的地球,是一个死寂的世界。不稳定的地质结构,使薄薄的地壳不断发生激烈活动。年轻的星球到处是地震、火山,加上宇宙尘埃的冲撞,内外地质作用的物质来源,逐渐形成了地壳。地壳的下部分,是由岩浆形成的玄武岩和花岗岩,上面部分则是由颗粒在水中慢慢沉积挤压形成的沉积岩。地球的岩石分为三类:岩浆形成的火成岩、沉积岩,以及由这两种岩石变质以后形成的变质岩。
The birth of the Earth, is a dead world. Unstable geological structure, so that the thin crust continue violent activities. The young planet is full of earthquakes, volcanoes, collisions with cosmic dust, material sources of geological effects both inside and outside the Earth, and the gradual formation of the crust. The lower part of the earth’s crust is composed of magmatic basalt and granite, while the upper part is the sedimentary rock formed by the slow sedimentation of particles in water. Earth’s rocks fall into three categories: magmatic igneous rocks, sedimentary rocks, and metamorphic rocks formed after the metamorphism of both rocks.