英語聽力頻道為大家整理的大學英語聽力下載：冰能給山拔高 你相信嗎，供大家參考:)
Moving glaciers can cause erosion on mountains, but the coldest glaciers, frozen in place, protect mountains and allow them to grow taller. Cynthia Graber reports
冰川移動會侵蝕山地（冰川移動通常會導致出現(xiàn)角峰和冰斗谷），但是最冷的冰川被凍得固定在某個地方，就會保護山脈并且還會讓它們“長高”。Cynthia Graber 報道
Glaciers slowly grind their way over mountains and plains, moving immense boulders and carving out fjords. That’s true in temperate regions, where glaciers—glacially—flow downhill. Over thousands of years, the frozen masses can scrape miles off of mountains. Researchers call it the glacial buzz-saw.
But for the very coldest climes, researchers now offer a counter-intuitive view of glaciers – they actually help mountains grow. The finding was published in the journal Nature.
A team led by scientists from the University of Arizona studied mountains in remote areas of Patagonia in South America.The Andes are actively growing. Hot rocks are shoved to the top, and erosion brings them back down the sides.The team collected 146 samples of rocks from mountainsides and then dated the rocks’ so-called cooling age, which reveals when the rock was exposed by erosion.
They found that erosion happened faster in the warmer mountains to the north, and more slowly in the colder mountains in the south.
Turns out that when glaciers are cold enough they don’t move much. Instead, they seal the mountains, protecting them from erosion. The scientists call the effect "glacial-armoring": an invaluable assist for peak performance.
Moving glaciers can cause erosion on mountains, but the coldest glaciers, frozen in place, protect mountains and allow them to grow taller. Cynthia Graber reports
冰川移動會侵蝕山地（冰川移動通常會導致出現(xiàn)角峰和冰斗谷），但是最冷的冰川被凍得固定在某個地方，就會保護山脈并且還會讓它們“長高”。Cynthia Graber 報道
Glaciers slowly grind their way over mountains and plains, moving immense boulders and carving out fjords. That’s true in temperate regions, where glaciers—glacially—flow downhill. Over thousands of years, the frozen masses can scrape miles off of mountains. Researchers call it the glacial buzz-saw.
But for the very coldest climes, researchers now offer a counter-intuitive view of glaciers – they actually help mountains grow. The finding was published in the journal Nature.
A team led by scientists from the University of Arizona studied mountains in remote areas of Patagonia in South America.The Andes are actively growing. Hot rocks are shoved to the top, and erosion brings them back down the sides.The team collected 146 samples of rocks from mountainsides and then dated the rocks’ so-called cooling age, which reveals when the rock was exposed by erosion.
They found that erosion happened faster in the warmer mountains to the north, and more slowly in the colder mountains in the south.
Turns out that when glaciers are cold enough they don’t move much. Instead, they seal the mountains, protecting them from erosion. The scientists call the effect "glacial-armoring": an invaluable assist for peak performance.