MOST rivers are basically because of erosion. but sometimes this is NOT actually true!
Generally they should be, but not in all cases - if there is a softer band of rock in the river bed then the river will erode this quicker and cause a deeper portion, or if the river flows quicker at one point then it will again erode quicker
There's more water the further down stream you get and therfore a higher amount of vertical erosion. Also the higher discharge (amount of water passing a certain point) will result in the movement of more and larger sediment types.
tributary
Generally yes, but not in all cases - if there is a softer band of rock in the river bed then the river will erode this quicker and cause a deeper portion, or if the river flows quicker at one point then it will again erode quicker
the longest river is the Nile in Egypt it is 6670 km in length
No ,there are many deeper rivers.
A lake
channel
A mature river
The river flows the fastest in the middle of the river.
Not always.
The middle part of a river may be called mid-stream, mid-river or mature river.
mature.
the river becomes excited and becomes wider deeper and more wet
A river in the mountains is moving faster than a river on a plain because it is losing altitude faster. A river on a plain is still moving with gravity, but not at the same steepness. The faster the river is moving, the more sediment it is taking which would form a valley much deeper and faster.