A Complete Collection of 100000 Whys
Fav十万个为什么
为什么山川会变迁？
1、地壳运动：地球内部的热量和构造运动导致地壳板块不断移动和碰撞，从而引起山脉的形成和变迁。
2、侵蚀作用：水流、冰川、风等自然力量会逐渐侵蚀山川，改变其形状和高度，使山川逐渐变得平缓。
3、沉积作用：河流、湖泊等水体在流动过程中会携带泥沙，沉积在低洼地区，长期积累形成新的地貌。
4、火山活动：火山喷发会形成新的山体和地貌，火山灰和熔岩冷却后也会改变地表形态。
5、人类活动：人类的工程建设和土地利用活动，如开山采矿、修建水库等，也会对山川的形态产生影响。
总之，山川的变迁是由自然力量和人类活动共同作用的结果，这些力量和活动在长时间尺度上不断改变着地球表面的地貌。
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