冰川移动会侵蚀山地（冰川移动通常会导致出现角峰和冰斗谷），但是最冷的冰川被冻得固定在某个地方，就会保护山脉并且还会让它们“长高”。
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.
秘鲁安第斯山脉的高山地区是马铃薯驯化的发源地，这儿的农民仍然种植着数千种外形仿如来自外星球的马铃薯。
High in the Peruvian Andes, where the potato was first domesticated, farmers still grow thousands of otherworldly looking varieties.
阿拉斯加图片。骑车通过软泥，三人一组骑山地自行车的成员努力向前推进横过崎岖的阿拉斯加山脉。
Riding through slush, members of a team of three cyclists press on in their effort to traverse the rugged Alaska Range by mountain bike.
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