| remove soil | 0.56 |
| shaped sandstone | 0.50 |
| occur in the low-flow c… | 0.47 |
| shaped mudstone | 0.45 |
| produced underground st… | 0.43 |
| produced cavern | 0.43 |
| pose threat | 0.43 |
| produced fissure | 0.42 |
| carved mountain | 0.41 |
| formed cave | 0.40 |
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| a nerve infection | 0.16 |
| loss of upper soil laye… | 0.16 |
| siltation | 0.20 |
| desertification | 0.16 |
| leakage | 0.16 |
| softness | 0.16 |
| natural process | 0.52 |
| the process | 0.43 |
| the action of surface p… | 0.37 |
| dominant process | 0.25 |
| caused by wind | 0.79 |
| caused by water | 0.74 |
| caused by rain | 0.70 |
| caused by wave | 0.64 |
| caused by ice | 0.59 |
| caused by frost | 0.50 |
| addressed | 0.50 |
| reduced | 0.50 |
| caused by snow | 0.48 |
| caused by sand | 0.48 |
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