Answer:
cycle of development of land relief, consisting of the sequence of the stages “youth,” “maturity,” and “old age.” The theory was formulated by the American geographer and geomorphologist W. M. Davis at the turn of the 20th century
Explanation:
model is simply a representation of a real thing. Geographers construct models to analyze geographic processes because the real object of study may be too large to examine, the processes which created it operate over too long of a time frame, or experimentation might actually harm or destroy it
