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| process where the surface of the earth is worn away by the action of water, glaciers, winds, waves |
| to dissolve out soluble constituents from ashes and soil by percolation |
| overthrust (ˈəʊvəˌθrʌst) | |
| —n | |
| geology Compare underthrust a reverse fault in which the rocks on the upper surface of a fault plane have moved over the rocks on the lower surface | |