All rocks are not the same, even though many of them look alike. There are three main types or classes of rock: sedimentary, metamorphic, and igneous. The differences between each of the rocks have to do with how they are formed. This is what determines the type of rock it is.
所有的石头是不一样的,尽管其中许多看起来一样。主要有三种类型的岩石:沉积岩,变质岩,火成岩。每个岩石之间的差异主要在于它们不同的形成方式。而如何形成也决定了岩石的类型。
The first type of rock is sedimentary. A sedimentary rock is formed from particles of sand, shells, pebbles, and other pieces of material. All of these particles together make up sediment. Sediment is the result of material broken down by weathering or erosion.
第一种类型的岩石是沉积岩。沉积岩形成于沙砾,贝壳,鹅卵石,或其他的物质的细小颗粒。所有这些颗粒共同组成了沉积岩。沉积岩是风化和侵蚀分解的结果。
Slowly, the sediment accumulates in layers and over a long period of time it will harden into rock. Sedimentary rock, usually, is fairly soft and may break apart very easily or crumble into pieces. If sedimentary rock is broken apart inside is sand, pebbles, or stones in the rock. Sedimentary rock is usually the only type of rock that also contains fossils. Fossils are the remains of once living animals or plants usually from long ago.
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