The materials making up chemical sedimentary rocks may consist of the remains of microscopic marine organisms precipitated on the ocean floor, as in the case of limestone. They may also have been dissolved in water circulating through the parent rock formation and then deposited in a sea or lake by precipitation from the solution. Halite, gypsum are formed by the evaporation of salt solutions and the consequent precipitation of the salts.
- make up [meik - ʌp] v. 组成
- consist of [kənˈsist - əv] v.由…组成
- microscopic organism [,maɪkrəˈskɔpɪk - ˈɔ:ɡənizəm] n. 微生物
- marine [məˈri:n] adj. 海洋的
- precipitate [priˈsipiteit] v. 沉淀
- in the case of [in - ðə - keis - əv] adv. 在……的情况下
- limestone [ˈlaimˌstəun] n.石灰岩
- dissolve [diˈzɔlv] v. 溶解
- circulate [ˈsə:kjuleit] v. 循环
- solution [səˈlu:ʃən] n. 溶液
- halite [ˈhælait] n.岩盐
- gypsum [ˈdʒipsəm] n.石膏
- evaporation [iˌvæpəˈreiʃən] n.蒸发(作用)
- salt solution [sɔ:lt - səˈlu:ʃən] n.盐溶液
