A narrow zone that marks the geological boundary between an upland region and a plain, distinguished by the occurrence of waterfalls and rapids…
| 单词 | θ2855 |
| 释义 | the world > the earth > water > rivers and streams > system > [noun] > natural drainage > specific river profile > fall line (3) fall line1882 A narrow zone that marks the geological boundary between an upland region and a plain, distinguished by the occurrence of waterfalls and rapids… fall zone1911 = fall line, n. 1. Subcategories:— specifically in U.S.A. (1) |
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