高山上的冰川缓慢地沿着山坡向下滑动,沿途刮削山石,形成巨大的山谷。看上去,冰川对于山峰的长高很不利,可是事实却并非如此。最近,美国一支科考队对南美洲的山脉进行了研究,那里的安第斯山脉正在不断地长高,地下的岩浆从火山顶喷出,然后又被冰川侵蚀,刮落到山坡上。 The glaciers on the mountains slowly slide down the hillside, shaving rocks along the way, forming a huge valley. It seems that glaciers are bad for the growth of the mountain, but this is not the case. Recently, a team of expeditions from the United States studied the mountains in South America, where the Andes are constantly growing. Underground magma erupts from the top of the volcano and is later eroded by glaciers and scraped onto the slopes.