cycle of erosion

noun
  1. the hypothetical sequence of modifications to the earth's surface by erosion, from the original uplift of the land to the ultimate low plain, usually divided into the youthful, mature, and old stages
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012