Morning Star solutions for टोटल जियोग्राफी [अंग्रेजी] कक्षा ९ आईसीएसई chapter 10 - Denudation [Latest edition]

The process of breaking and removing the rocks from the surface of the earth:

Denudation is the process that wears away landmass and reshapes the surface of the earth. Which of the following process is NOT involved in it?

The disintegration of rocks by atmospheric agents at or near the surface of the earth:

The displacement of rocks by agents like wind, water, or ice:

The large-scale movement of loose materials (rock-waste) down the slope on account of gravity:

Assertion (A): In the upper course, the dominant activity of a river is erosion.

Reason (R): The river flows swiftly as the gradient is steep.

The laying down of material that has been weathered, eroded and transported by natural processes such as water, wind and ice.

The streams or small rivers which join the main river are called ______.

When a river divides into channels or smaller rivers, they are called its ______.

Assertion (A): River meanders are bends of longitudinal courses.

Reason (R): Meanders are the result of both erosion and deposition under conditions of a gentle slope and sufficient water in rivers.

In the upper course the dominant activity of a river is ______.

In the middle course of a river, the gradient is gentle, so the flow of the river slows down such that it appears like a snake over its floodplains, forming which of the following?

______ are moon-shaped dunes.

Stationary, long and narrow sand-ridges which grow parallel to the direction of the prevailing wind and remain in a fixed position.

The lowering of land, rounding of exposed rock surfaces and levelling of the peaks:

 Assertion (A): In the lower course of the river, all the ideal conditions for depositional landforms exist.

Reason (R): The load-transporting capacity is drastically reduced due to sluggish flow as well as division of a river into many distributaries.

Which amongst the following is not a factor affecting the work of a river?

How do migratory dunes damage towns and villages?

Assertion (A): Barchans are moon-shaped live dunes.

Reason (R): The migration of the barchans is a threat to desert life.

Name the landform that is formed as a result of the action of wind wherein loose materials are lifted and blown off to be deposited outside the desert margins.

See the above figure of a barchan and identify the direction of the wind.

Complete the following table.

What do you mean by denudation?

Name the factors which affect the work of a river.

What is the main function of a river in its upper course?

Name the landforms formed in the upper course of a river.

How is a waterfall formed?

State the two characteristics of a river in its middle course.

How are meanders formed?

Give one example of a meander.

Name two landforms in the lower course of a river.

Where is wind erosion most predominant?

What are known as Deflation Hollows?

Name two chief landforms of wind deposition.

Name two chief types of sand dunes.

State any two characteristics of barchans.

Distinguish between:
Weathering and Denudation

Name the various processes involved in denudation.

What are the results of denudation?

Give a geographical reason for the following:

Erosion is the dominant activity of a river in its upper course.

Give a geographical reason for the following:

Landforms of deposition are more prominent in the middle course of a river.

Give a geographical reason for the following:

All the rivers do not form deltas.

Describe the work of wind erosion.

State two important landforms of wind erosion.

Name the factors which affect the work of a river.

Describe the three stages of a river.

Give a geographical reason for the following:

The effects of wind erosion are more pronounced in desert areas.

Give a geographical reason for the following:

Migratory sand dunes are uncertain and dangerous.

Give a geographical reason for the following:

Long rooted trees and sand holding grasses are grown bordering fields near deserts.

State the factors on which the shape and size of dunes depend.

Given below is a photograph of Purwa Waterfall on the River Tamsa in Madhya Pradesh. Answer the following questions:

1. What stage is the River Tamsa at to cause the formation of this waterfall? Give reasons to support your answer.
2. What other landforms would a river make in this stage?
3. What landforms would the River Tamsa make in the next stage of its flow?
4. 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.

While travelling from Haridwar to Prayagraj, the course of which river did you follow? List the landforms associated with it along the course you followed.

On the outline map of the world, mark the following on the continent:

Rivers which form deltas

On the outline map of the world, mark the following on the continent:

Desert

Prepare a power point presentation on the effects of rising sea levels due to global warming in the world’s most populated delta – the Ganga Brahmaputra delta.

In the denudation chapter you have studied the action of winds that results in desertification in arid areas. Make a list of activities that could prevent and reverse desertification.