瀑布通常是年輕的時形成的一條河流。在這些時候，信道往往是窄而深的。當河道耐蝕的基岩上，的侵蝕緩慢發生，而下游的侵蝕更迅速地發生。由於水道的速度在增加的瀑布的邊緣，撥弄材料的河床。漩渦的動盪以及沙子和石頭進行的河道的沖刷能力增加。使瀑布開拓更深入的床和退上行。往往隨著時間的推移，會退去的瀑布回來，形成一個回落上游的峽谷和峽谷下游，它會雕刻深入山脊之上。撤退的瀑布率可以作為一個半平方米每年。
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| 熱門國家 | 系統支援 | 版本 | 費用 | APP評分 | 上架日期 | 更新日期 |
|---|---|---|---|---|---|---|
| 未知 | Android Google Play | 1.0 App下載 | USD$0.99 | 1970-01-01 | 2015-03-12 |
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