Tag: external forces - responsible for changes

Running water flows naturally in a direction according to gravity along the slope and makes its own way. This is called a flow of water. When many such flows of water come together, a river is formed.

The glaciers carry sediments with them. These sediments are called moraines. Depending on the location of the deposits, moraines can be divided into four type.

The riverbed and the river banks get eroded because of the fast flow of water, sand particles, pebbles etc, and the various tributaries joining the main river. All these lead to the formation of gorges, V-shaped valleys and waterfalls.

Following are the factor responsible for erosional transportational and depositional work of a river:-

• Slope of land
• The type of rock
• Volume of water flowing in the river
• The length of flow
• Volume of sediments in the river

Depending on the location of the deposits, moraines can be divided into four type which are as follow:-

• Ground Moraines
• Lateral Moraines
• Medial Moraines
• Terminal Moranies

 The Jakobshavn Glacier in Greenland is one of the fastest moving glaciers in the world. It moves at the rate of 46m per day.

Glaciers move at different velocities daily ranging from 1 cm to 1 m. The Jakobshavn Glacier in Greenland is one of the fastest moving glaciers in the world. It moves at the rate of 46m per day.

The movement of air is called wind. Wind is a gaseous agent of erosion. The erosional, transportational and depositional work of wind is more prominent in deserts and semi-arid region.

Wind carries small sand particles, small pebbles, etc. along with it. These particles cause erosion along rocks coming in the way due to friction. This leads to formation of mushroom rocks, deflation hollows, yardangs, etc.

Afforestation is the process of planting trees on a large scale, which helps to stabilize the soil and prevent erosion.