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21 km/h in the rivers frame of reference.
They are formed by deposition of sediments from rivers and streams.
Fast flowing rivers are more erosive and are light on the deposition of sediments. Slow flowing rivers allow for the deposition of sediment which create the meanders.
Fluvial deposition.
Add the rivers velocity to the boats velocity
Sediment
the work of rivers can be seen in three ways namely 1. transportation of materials from uplands to lowlands 2. erosion by rivers and the resultant features 3. deposition by rivers and its effects
The deposition of water (its precipitation) is called rain. Rain falls and collects in rivers, rivers carve out valleys in the land. Therefore a river valley is a land feature created by water.
At its lowwer course, during the matured stage, the rivers velocity and erosive power greatly reduces, because now it flows through a relatively wide/broad and shallow course. Deposition of sediments occurs as the river moves on progressively, this materials left along interfers with its normal flow, resulting in a winding courseway, forming meanders.
When their velocity decreases
It slowly degrades shores and walls on the sea or rivers.
Glaciers and rivers transport eroded rock material (sediment), that can form new sedimentary rock after deposition.