volcanic bombs造句

• Four major rock types are found within the reserve . from the oldest to the youngest , they are the tuffs with volcanic bombs , granodiorites , porphyritic rhyolites and basaltic dykes , respectively . geomorphologically , the marine reserve has typical exposed rocky shore of south - easterly - directed capes and headlands in hong kong
  鹤咀海岸保护区内可以找到四种主要岩石种类，以岩石形成的年代计算，最古老的是火山爆发形成的凝灰岩，然后依次是花岗闪长岩,流纹斑岩及玄武岩。