100+ Rivers of India Gk Quiz Questions for Competitive Exams - 2

Question: 6

How does erosion take place by lifting?

The strong force of the running water swiftly erodes loosely consolidated materials and lift them into the moving water.

Question: 7

Write a note of V shaped valley?

V-shaped valleys often occur in the upper courses of rivers, where the stream has a strong swift current that digs its valley relatively rapidly. At this stage the river valley is V-shaped.

Question: 8

Differentiate between chemical and mechanical erosion?

Mechanical erosion - is the disintegration of rocks by mechanical forces without any change in their chemical composition. It takes place mainly due to temperature change, freezing action of water and the action of plants and animals.

Chemical erosion – is the gradual decomposition of the rock owing to the reaction and combination of the minerals of the rock with oxygen or carbon dioxide. The resulting new minerals from the chemical combination are bigger and cause the rock to swell and crumble.

Question: 9

What are oxbow lakes?

When a river floods, it may cut across the narrow part of the loop, making a new, shorter channel. The loop is left as a lake known as an oxbow lake.

Question: 10

What is the reason for the growth of evergreen forests in equatorial region?

Due to heavy rainfall throughout the year, evergreen forests are grown in the equatorial region.