How r the rivers formed?

Answer 1

Rivers provide us with food, energy, recreation, transportation routes, and of course water for irrigation and for drinking. But where do they start and where do they end?

Rivers begin in mountains or hills, where rain water or snowmelt collects and forms tiny streams called gullies. Gullies either grow larger when they collect more water and become streams themselves or meet streams and add to the water already in the stream. When one stream meets another and they merge together, the smaller stream is known as a tributary. The two streams meet at a confluence. It takes many tributary streams to form a river. A river grows larger as it collects water from more tributaries. Streams usually form rivers in the higher elevations of mountains and hills.

The areas of depression between hills or mountains are known as valleys.

A river in the mountains or hills will usually have a deep and steep V-shaped valley as the fast moving water cuts away at the rock as it flows downhill. The fast moving river picks up pieces of rock and carries them downstream, breaking them into smaller and smaller pieces of sediment. By carving and moving rocks, running water changes the earth's surface even more than catastrophic events such as earthquakes or volcanoes.

Leaving the high elevations of the mountains and hills and entering the flat plains, the river slows down. Once the river slows down, the pieces of sediment have a chance to fall to the river bottom and be "deposited". These rocks and pebbles are worn smooth and get smaller as the water continues flowing.

Most of the sediment deposition occurs in the plains. The wide and flat valley of the plains takes thousands of years to create. Here, the river flows slowly, making S-shaped curves which are known as meanders. When the river floods, the river will spread out over many miles on either side of its banks. During floods, the valley is smoothed and tiny pieces of sediment are deposited, sculpting the valley and making it even smoother and more flat. An example of a very flat and smooth river valley is the Mississippi River valley in the United States.

Eventually, a river flows into another large body of water, such as an ocean, bay, or lake. The transition between river and ocean, bay or lake is known as a delta. Most rivers have a delta, an area where the river divides into many channels and river water mixes with sea or lake water as the river water reaches the end of its journey. A famous example of a delta is where the Nile River meets the Mediterranean Sea in Egypt, called the Nile Delta.

From the mountains to the delta, a river does not just flow - it changes the surface of the earth. It cuts rocks, moves boulders, and deposits sediments, constantly attempting to carve away all of the mountains in its path. The goal of the river is to create a wide, flat valley where it can flow smoothly towards the ocean.

Answer 2

A water spring will erode from the mountain and it will fall from it . It is called water falls. Later it will run on the valley as a stream .Then it will become a small river. Few small rivers join together as Big river.

Answer 3

Either by underground aquafers that surface and form lakes, or man made lakes, both of which, if large enough, overflow from rain or snowmelt and start flowing downhill. As multiple flows, usually creeks, come together they create a river. I'm sure there is a much more technical way of explaining it but that's it in a nutshell.

Answer 4

Most of the time, they start from run-off (e.g. melting snow) and as the water collects, it starts eroding the dirt in its path and creates a groove for the water to run down. This gradually grows and makes a stream. They may eventually join other rivers and run off into lakes or find the ocean or more likely, they dry up, leaving paths in the dirt that they flowed over.
Or you may want to try this--> http://ga.water.usgs.gov/edu/earthrivers.html
Well, hope that helps. Good luck with that! O_o

Answer 5

Springs on the top of a mountain start to flow downward and unite with other springs. They form a creek. creeks that unite with other creeks form rivers.

Answer 6

in the snowy mountains, ice glaciers melts , resulting in the emergence of river from it....
in the plains, rivers are formed by the aquafers being broken off in times...... when it get exposed to light in millions of years.....

Answer 7

The eroding away of rock/ground. Once erosion starts the river gets bigger and bigger.

Answer 8

by doing sex with each other.******* is the best source of formation of rivers

Answer 9

Two ways, General erosion due to run-off, and geological activity.

Answer 10

By rain