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mature.
A mature river
A mature river erodes its channel wider rather than deeper. The gradient of a mature river is less steep than young rivers, and the water flows more smoothly. Examples of mature rivers are the Thames, Mississippi, and Ohio rivers.
The Factor is coastline
channel
Vertical erosion occurs when the river erodes it's bed, causing the deepening of the bed. Laterial erosion occurs when the river erodes it's banks, causing it's channel to widen.
Canyons such as the grand canyon usually a river cuts/erodes rocks and deposits the minerals some where else which through out years it grows deeper and deeper.
A frozen river that erodes slowly is called a glacier.
A river channel is formed by rock and soil of a stream being transported down, during this process the channels become wider and deeper.
the river becomes excited and becomes wider deeper and more wet
As a river continues its journey towards the sea, the valley cross section continues to become wider and flatter with an extensive floodplain either side of the channel. The river erodes laterally and deposition also becomes important. By the time it reaches the lower course the river is wider and deeper and may contain a large amount of suspended sediment.
Kinetic energy is involved when a river moves sediment or erodes its banks.