Question

why is the speed of the river fast in the mountains and slow at the mouths​

Answer 1

Answer:

mountains have a steep terrain, which help in the quick flow of water in river. but at the mouth, the terrain is flat. so water flow is low.

Explanation:

Answer 2

Answer:

The force of gravity, which pulls water downhill, is what gives moving river water its energy which cause a fast pace in mountains.

A delta is created near the river mouth when significant amounts of alluvium are deposited there which makes mouth slow-paced.

Explanation:

Reasons for a fast pace in mountains:

• A river will flow more quickly and with greater energy at a steeper slope.
• Anything that expands the channel's surface area will often cause the water to flow more slowly as a result of increased friction.
• Anything that decreases surface area also decreases friction, which results in a faster flow.
• A river is strong enough to erode the ground beneath it as it flows through mountains with steep sides and V-shaped valleys.
• The river slows down as it descends and goes into flatter terrain.
• It gets broader and deeper at this point, making it appropriate for boats and even huge ships.

Reasons for slow pace in mouth:

• The river loses its ability to carry all the silt, sand, and clay to the mouth since the river is moving more slowly there.
• As a river moves steadily downstream, its slope declines.
• The pull of gravity is stronger going uphill and less forceful going downhill.
• The gradient is smaller at the mouth, allowing water to flow over a large surface area.

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