وبلاگ بزرگ مقالات زمین شناسی | هفته چهارم آذر ۱۳۸۷
Clay. A term used to refer to the finest-grain particles in a sediment, soil, or rock. According to the Wentworth scale (see table), clay is finer than silt, characterized by a grain size of less than approximately 4 micrometers. However, the term clay can also refer to a rock or a deposit containing a large component of clay-size material.