| 单词 | base level |
| 释义 | > as lemmasbase level base level n. Physical Geography the lowest level to which a land surface can be eroded by running water.Sea level constitutes the continental or master base level; a local base level may be different from this. ΚΠ 1875 J. W. Powell Explor. Colorado River (Smithsonian Inst.) II. xii. 203 We may consider the level of the sea to be a grand base level, below which the dry lands cannot be eroded. 1889 Amer. Jrnl. Sci. 137 430 Given time enough, and the faulted ridges of Connecticut must be reduced to a low base-level plain. 1939 E. B. Bailey & J. Weir Introd. Geol. xxxii. 188 Sea-level is often called the base level of stream erosion, although rivers do cut a little below sea-level. 2002 M. T. Sullivan Labyrinth 164 Huge caverns..created over tens of thousands of years of having water cut tunnels this way and that, searching for a way down to..master base level—the water table, effectively. < as lemmas |
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