片麻岩

例句：

1. 1.The rock formation is made up of layers of igneous and metamorphic rocks.
   这种岩石构造是由层状的火成岩和变质岩组成的。
2. 2. The geologist found that the gneiss was formed during the early stages of the Earth's crust formation.
   地质学家发现，片麻岩是在地球地壳形成初期形成的。
3. 3. The schist is a type of sedimentary rock that has been folded and metamorphosed over millions of years.
   片麻岩是一种经过数百万年折叠和变质的沉积岩。