stratified sand

例句：

1. 1. The geologist studied the stratified layers of the rock.
   地质学家研究了岩石的分层。
2. 2. The fossils found in the stratified sediment are evidence of ancient life.
   在分层沉积物中发现的化石是古代生命的证据。
3. 3.The stratified structure of the mountain is due to its long history and continuous weathering.
   这座山的分层结构是由于其悠久的历史和持续的风化作用造成的。