We walked upon granite mingled with siliceous tufa.
我们走在混有硅质凝灰岩的花岗岩上。
历年英语专业八级阅读真题
Under the changes of weather it may look like marble or like sea water, black as slate in the fog, white as tufa in sunlight.
在天气的变化下, 它可能看起来像大理石或海水,在雾中像石板一样黑, 在阳光下像石灰华一样白。
地心游记-The journey to the heart of the Earth
Iceland, which is entirely devoid of alluvial soil, is wholly composed of volcanic tufa, that is to say, an agglomeration of porous rocks and stones.
冰岛完全没有冲积土,完全由火山凝华组成,也就是说,多孔岩石和石头的聚集体。
中文百科
石灰华
石灰华,又称「钙华」,是碳酸钙含量较多的河流、湖泊或泉水所形成的碳酸钙沉积物。
碳酸钙
沉积物
英文名称:tufa (该词常见于耶鲁公开课中的“罗马建筑”)
定义1:碳酸钙碎屑与苔藓、地衣等生物残体凝结而成多孔隙的灰华。
应用学科:地理学,地貌学
定义2:岩石中的钙质等化学元素溶解后沉淀形成各种可观赏的形态。
应用学科:资源科技,旅游资源学
英语百科
Tufa 石灰华
Tufa is a variety of limestone, formed by the precipitation of carbonate minerals from ambient temperature water bodies. Geothermally heated hot springs sometimes produce similar (but less porous) carbonate deposits known as travertine. Tufa is sometimes referred to as (meteogene) travertine; care must be taken when searching through literature to prevent confusion with hot spring (thermogene) travertine. Calcareous tufa should not be confused with tuff, a porous volcanic rock with parallel etymological origins that is sometimes called "tufa".