“岩层”用英语怎么说

“岩层”的拼音为：yán céng...

较老的岩层渐渐风化.The older strata gradually disintegrate.岩层中有证据表明，该地区在15,000年前曾经非常干旱。Contained within the rock strata is evidence that the region was intensely dry 15,000 years ago.这一岩层中有大量燧石.This layer of rock contains a lot o...