题目内容
粘土岩主要是指粒度<0.05mm的细颗粒组成，并含大量粘土矿物（高岭石、蒙脱石、水云母等）的疏松或固结的岩石。
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由于上覆沉积物与水体的压力，松散的沉积物逐渐脱水、压实，同时由于粒间水的溶解、沉淀，使颗粒互相胶结而固化成岩，这个过程叫做成岩作用。
常见的胶结物类型包括硅质、钙质、铁质和泥质四个种类。
The Second Continental Congress was held in Philadelphia, and the Continental Army and Navy were established under the command of Thomas Jefferson.
Westward expansion was enhanced further by the Arizona Gold Rush following the discovery of gold in that state in 1848.
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