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Q:- What is stage
In the evolution of landforms, devis has identified three stages (times series). These stages of erosion are: (i) youth, (ii) old. Just as each process gives rise to distinctive landscape, so also each stage of the erosioin cycle is characterized by distinctive  landforms with the help of which it is possible to identify the stage of evolution of landscape. There is a direct relationship between the stage of development and the character of landfoems.
     The main assumptions of Davis’ model of ‘geographical cycle of erosion’ are:

1.    Landforms are the products of the interactions of endogenetic (diastrophic) forces and the exogenetic (external) forces, originating from the atmosphere (weathering, running water, wind, groundwater, sea waves and glaciers).

2.    The evolution of landforms takes place in a sequential manner.

3.    Streams erode their valleys rapidly downward until the graded condition is achieved.

4.    There is short period of rapid rate of upliftment in landmass.

5.    Erosion does not start until the upliftment is complete. In other words, upliftment and erosion do not proceed simultaneously. This assumption has severely criticized by the subsequent geomorphologiests.

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