Physical Geography. Undercutting by water, esp. backward erosion by a waterfall of softer layers of rock at its base; headward erosion of hillsides…
| 单词 | θ5252 |
| 释义 | the world > the earth > structure of the earth > formation of features > erosion or weathering > [noun] > undercutting (1) sapping1863 Physical Geography. Undercutting by water, esp. backward erosion by a waterfall of softer layers of rock at its base; headward erosion of hillsides… |
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