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it happens because of erosion in the surface of the earth creating a canyon.
If there was a change in sea level due to land being uplifted then the river would have more potential energy to cut into the earth.
There are several potential causes. If a change upstream decreases a river's sediment supply, then them there is less sediment to deposit, and the river will begin to incise. The land over which the river flows may be uplifted by tectonic forces, causing the river to cut downwards. Finally whatever the stream drains into may decrease in elevation. This generally happens when the water level of the lake or sea that a river drains into drops.
when earth and wind break down rocks
Deposition changes the surface of earth by eroding away the surface.
Moving water effects the earth materials by slowly eroding or breaking it down.
One of the ways is that it carves it by weathering and eroding it away.
weathering
Gravity
a constructive force is a natural event that helps the earth like, weathering. weathering helps the earth by depositing sediments into other spots
All beaches are in a constant state of change, that is Nature's Way on Planet Earth.
Sediment