沉积物缓慢的层层聚积,长时间后就会硬化成岩石。沉积岩通常是相当柔软,很容易掰开或是破碎成片。沉积岩破裂,岩石内部是沙子,卵石。通常情况下,沉积岩是唯一含有化石的岩石。化石通常是指很久很久以前曾经有生命的动物或植物的遗迹。
Examples of sedimentary rock types include limestone, shale, and sandstone.
沉积岩包括石灰岩,页岩和砂岩。
The second type of rock is metamorphic. A metamorphic rock is formed under the surface of the earth from the change that takes place because of intense heat or pressure. In nature, it takes millions of years for a metamorphic rock to be formed. The rocks that result from this very long process often has ribbon-like layers and many shiny crystals. The crystals are formed by minerals which grow slowly over time on the surface of the rock.
第二种类型的岩石是变质岩。变质岩是在高温或强压导致的地形变化的地表形成。自然界形成一颗变质岩需要上百万年。从这个漫长的过程导致岩石常呈带状并含有许多有光泽的晶体。该晶体由随时间缓慢增长在岩石表面的矿物形成。
Examples of metamorphic rock types include gneiss, marble, slate, and quartzite.
变质岩类型的例子包括片麻岩,大理石,板岩,石英岩。
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★ Excerpts from Lei Feng’s Diary《雷锋日记》节选十五
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2020-09-15
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