Physical Geography and Geology. Persistence of the original course of a stream, river, or drainage system despite subsequent changes in topography.
| 单词 | θ2852 | 
| 释义 | the world > the earth > water > rivers and streams > system > 			[noun]		 > natural drainage > forming of spec. (1)		 antecedence1900 Physical Geography and Geology. Persistence of the original course of a stream, river, or drainage system despite subsequent changes in topography.  | 
	
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