地理漫步·世界地理英语30篇（7）
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Valleys Form Where Rivers Cut Deep
河谷：河流深切之地
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Rivers cut valleys into mountains and hills over time.河流经年累月在山地和丘陵中切割出河谷。
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Valley shapes depend on rock type and water speed.河谷形状取决于岩石类型和水流速度。
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V-shaped valleys form in steep, young mountain areas.V形谷多形成于陡峭、年轻的山区。
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U-shaped valleys come from ancient glacier movement first.U形谷最初由古冰川运动塑造而成。
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Wide valleys often hold rich farmland and big cities.宽阔的河谷常孕育肥沃农田和大型城市。
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Valleys guide roads, railways, and human settlement patterns.河谷引导着道路、铁路及人类聚居格局。
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Some valleys trap air and cause fog or pollution buildup.一些河谷会滞留空气，导致雾气或污染物积聚。
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Valley floors collect sediment, making soil fertile for crops.河谷底部沉积泥沙，使土壤肥沃，适宜耕种。