Question

which valleys are formed at youthful stage of a river​

Answer 1

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The river is usually small and flows down steep slopes with lots of energy. The features found in the youthful stage of a river are all formed by the processes of Erosion. The river will erode downwards in its youthful stage. This is called vertical erosion.

Answer 2

Explanation:

Classifying Rivers - Three Stages of River Development

River Characteristics - Sediment Transport - River Velocity - Terminology

The illustrations below represent the 3 general classifications into which rivers are placed

according to specific characteristics.

These categories are: Youthful, Mature and Old Age. A Rejuvenated River, one with a

gradient that is raised by the earth's movement, can be an old age river that returns to a

Youthful State, and which repeats the cycle of stages once again.

A brief overview of each stage of river development begins after the images.

A list of pertinent vocabulary appears at the bottom of this document. You may wish to

consult it so that you will be aware of terminology used in the descriptive text that follows.

Characteristics found in the 3 Stages of River Development:

Youthful River:

Perhaps the most dynamic of all rivers is a Youthful River.

Rafters seeking an exciting ride will surely gravitate

towards a young river for their recreational thrills.

Characteristically youthful rivers are found at higher

elevations, in mountainous areas, where the slope of the

land is steeper. Water that flows over such a landscape

will flow very fast.

Youthful rivers can be a tributary of a larger and older

river, hundreds of miles away and, in fact, they may be

close to the headwaters (the beginning) of that larger

river.

Upon observation of a Youthful River, here is what one might see:

1. The river flowing down a steep gradient (slope).

2. The channel is deeper than it is wide and V-shaped due to downcutting rather than

lateral (side-to-side) erosion.

3. Its velocity is fast and strong and ...

4. Capable of moving all sediment sizes from ions in solution, to silts and clays, also

cobbles and boulders.

5. Steep sided cliffs flank the river.

6. A floodplain does not exist. There are no grassy areas beside the river where a person

can walk.

7. Rapids may be present due to the water velocity and the presence of boulders in the

channel. Waterfalls are also a feature of a young river.

8. Erosion is prominent over deposition.

Mature River: