The slope is high and low on the land surface. The slope decline is the shrinkage of the slope angle, while the retreat is the change of the scrap position.
What is the slope?
The slope is the high and low or up and down of the land surface. It can be convex, concave, straight, or compound.
Slope decline:
The decrease in the angle of slope as the incision of the river becomes uniform. The decline or shrinkage of the slope. This makes the slope gentler and it combines with regolith (the upper crust of the earth).
Slope retreat:
The geologic process by which the position of the escarpment changes. By escarpment is meant the slope lift of the hills or mountains that it can retreat for about ten kilometers.
Therefore, the above statements aptly explain slope decline and slope retreat.
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