Geography
Answer
The factors on which the shape and size of dunes depend are:
- The direction and force of wind.
- The speed of wind, carrying the dust and sand particles.
- The nature and amount of sand brought by the wind.
- Water features like lakes, streams etc., in the close-by area.
- The nature of vegetation on the land.
- The nature of the surface, where the formation of a sand dune takes place.
Related Questions
Describe the three stages of a river.
Give a geographical reason for each of the following:
(i) The effects of wind erosion are more pronounced in desert areas.
(ii) Migratory sand dunes are uncertain and dangerous.
(iii) Long rooted trees and sand holding grasses are grown bordering fields near deserts.
Given below is a photograph of Purwa Waterfall on the River Tamsa in Madhya Pradesh. Answer the following questions:
(a) What stage is the River Tamsa to cause formation of this waterfall? Give reasons to support your answer.
(b) What other landforms would a river make in this stage?
(c) What landforms would the River Tamsa make in the next stage of its flow?
(d) Besides being a tourist attraction waterfalls are important sources of energy. Elucidate.
What is the relationship between denudation, weathering and erosion? Give examples to support your answer.