6. During its course, a river passes through
different stages.
Answers
Answer:
Nearly all rivers have an upper, middle, and lower course. The beginning of a river, when it flows quickly with lots of energy, is called a young river. ... The middle of a river's journey, when it gets wider and slows down, is called the middle age. Rivers often meander (follow a winding path) along their middle course.
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Answer:
There are three stages of river early, young and old and it could be observed in the same river at different stages.
The first is early stage. At this stage, the river get its supply through streams, lakes, or combination. The flow is fast and the water continuously erodes the lower bed/surface. The materials composition found in the river like boulders and structure like falls also describes about it's age/stage.
The next is grown stage. Here the river is fledged with enough water from attributes . The volume of water increases considerably as it gets more and more supply downstream. The river scours the bed and cuts the bank. They actively transport material from one place to another. The materials are characterized by boulders,cobbles, stones that are larger in size and still carried away by the river energy. These are hard to find in the old stage river.
Third is old stage. They are characterized by the meandering appearance. At this level they have low flow gradient and hence energy is low. The carrying capacity decreases and river starts depositing on its bank . At this stage river looks wider in appearence and has sand and small stones along it's flow. They lack boulders. Some of the river are also braided at this stage.
The initial stage of river is seen in the upper region of the Himalayas or mountains where the terrain is steep. Midlands characterises the grown stage while plain the old stage in the same river.