A third type of mountain may beformed as a result of volcanic activity which occurs in regions of active fold mountain belts, such as in the Cascade Range of western North America.
第三种类型的山可能是由于火山活动形成的,一般发生在活动性褶皱带地区,如北美西部的喀斯喀特山脉。
2
It can beformed into park benches, playgrounds and so on.
它可以形成公园的长椅,操场等等。
3
Six identical triangles can beformed by drawing two straight lines through an octagon's center point.