Detailed explanations in West Bengal Board Class 10 Geography Book Solutions Chapter 1.1 Exogenetic Forces offer valuable context and analysis.
WBBSE Class 10 Geography Chapter 1.1 Question Answer – Exogenetic Forces
Answer in short : 2 Marks
Question 1.
What do you mean by landform ?
Answer:
Landform refers to the shape, height, ruggedness, slope etc. of the earth’s surface. In a nutshell, landform is the appearance of the surface of the earth. According to W.M. Davis, ‘Landscape’ is the function of structure, process and stage.
Question 2.
What do you mean by landform creating processes ?
Answer:
The physical and chemical processes that have been working since the birth of the earth to create, change, reform or rebuild a landform are called landform creating processes. In short, the processes that act inside and outside the earth’s surface and lead to formation of various landforms are called landform creating processes.
Question 3.
What are exogenetic processes of landform building ?
Answer:
The processes of landform creation that derive their force from natural sources like sun, wind, heat, air pressure, humidity, rainfall, river, glacier, sea waves etc. are called exogenetic processes. The main sources of energy of such processes are the sun and the earth’s atmosphere.
Question 4.
What do you mean by base level of erosion ?
Answer:
A base level of erosion is an imaginary surface of irregular shape, inclined towards the lower end of the principal river or its trunk, under which the stream and its tributories were unable to erode. It can be further divided into ground base level, temporary base level and local base level.
Question 5.
In how many parts can exogenetic forces be divieded ?
Answer:
Exogenetic forces on landform creation can be divided into two parts – i. Static physical forces : atmospheric heat, pressure, humidity, cloud cover, rainfall, dew frost etc. ii. Dynamic physical forces : river, wind, glacier, mass wasting, sea waves, ocean currents etc.
Question 6.
What is gradation?
Answer:
According to Chamberlen and Salisbury (1904) gradation is a process by which the uneven and rough surface of the earth is gradually smoothened by erosion or deposition in order to attain a plain and polished landform. This is brought about by the exogenetic processes by changing the heights of the different landforms.
Question 7.
Classify the exogenetic processes.
Answer:
Question 8.
What is degradation?
Answer:
The process by which the height of mountains, hills and plateaus are reduced by erosion and mass removal, which result in lower landforms is known as degradation as a whole. The processes of degradation can be divided into weathering, erosion and mass wasting.
Question 9.
What is weathering ?
Answer:
Weathering comes from the word ‘weather’. Weathering refers to breaking or fragmentation of rocks by the action of different weather elements like heat, pressure, humidity, cloudiness, rainfall, dew etc. The broken rock fragments lie in situ.
Question 10.
What is erosion?
Answer:
The process of removal of broken and fragmented rock material by dynamic forces of nature like river, wind, glacier, waves etc. thus reducing the height of the original landform is called erosion.
Question 11.
What is mass wasting ?
Answer:
In hilly regions, if rain water percolates through the soil or rocky beds, the materials get loosened. These soil and rocky materials may fall down in huge masses along the slope due to gravitational force. Such movement of earth materials in huge masses along slope of land is called mass wasting.
Question 12.
What is aggradation?
Answer:
The earth materials brought down by the dynamic forces of nature (river, glacier, wind etc.) due to degradation are deposited in the lower slopes in lowlands, basins or depressions. The process of such accumulation of materials, thus increasing the height of the current landform, is known as aggradation.
Question 13.
Name some landforms formed by degradation.
Answer:
Landforms created by degradation are : monadnock, inselberg, mesa, butte, dhand of desert region, corrie, corrie lake etc.
Question 14.
Name some landforms formed by aggradation.
Answer:
Landforms created by aggradation are : loess plains, flood plains, alluvial cones and fans, moraines, drumlin, outwash plains, sand bars, beaches, stalactite, stalagmite etc.
Question 15.
What is the last limit of erosion?
Answer:
When the exogenetic processes cut and lower an undulating rugged highland to a smooth slope where no more erosion occurs, this is known as the last limit of erosion.
Question 16.
What are the biological processes of landform creation?
Answer:
The exogenetic processes that cause weathering, transportation, erosion and deposition of earth materials due to interference of biological agents like man, plants and animals are called biological processes of landform creation.
Question 17.
What is denudation?
Answer:
When the weathered earth materials are removed from their position by erosion and mass wasting, the surface beneath the debris becomes open and forms a new landform. This process of opening up of the new surface of the landform is called denudation.
Denudation = Weathering + erosion + mass wasting.
Question 18.
How can mass wasting be classified?
Answer:
Mass wasting can be classified into two parts – i. Slow flowing and ii. Fast flowing.
Question 19.
What do you mean by gradational forces?
Answer:
Landforms are initially formed with the help of geotectonic forces that work from within the earth’s interior. These are further sculptured by the static and dynamic forces that act on the surface of the earth. These forces tend to reduce the landforms to a smooth rolling plain or graded profile. These forces are known as gradational force.
Question 20.
Name the different gradational forces.
Answer:
The gradational forces are broadly classified into two parts –
i. Static forces – These are the forces that have no motion, but help in formation or sculpturing of landforms. Eg. – Heat, pressure, humidity, cloudiness, rainfall etc.
ii. Dynamic forces – These are the forces that have motion and help actively in changing landforms. Eg. – rivers, wind, waves, glaciers, ocean currents etc.
Question 21.
How can the degradation processes be classified?
Answer:
Degradation processes can be classified into – i. weathering ii. erosion iii. mass wasting.
Question 22.
What is the outcome of gradation?
Answer:
By gradation, the lower regions are filled up and elevated while the higher regions are reduced, so that ultimately a smooth and rolling plain is formed, where neither erosion nor deposition is required.
Question 23.
Why do some geologists refuse to consider weathering as a part of gradational process?
Answer:
In weathering, rock fragments break off from parent rocks, but they are not removed from position. They lie in dumps where they have been broken from. Thus, height or altitude of the landform is not much reduced, and no gradation is achieved unless the materials are removed. Hence, some geologists refuse to consider weathering as a part of gradational process.
Question 24.
What are biological processes of gradation?
Answer:
The processes by which plants, animals and man interfere and cause weathering, transport and erosion of rock fragments, deposition of these debris in low lands, thus causing formation of a graded profile are called biological processes of gradation.
Question 25.
Name four exogenetic forces.
Answer:
The exogenetic forces are- i. River, ii. Wind, iii. glacier iv. Sea waves.
Answer briefly : 3 Marks
Question 1.
What do you mean by exogenetic processes? Give examples.
Answer:
The word ‘Exogenetic’ comes from the words ‘Exo’ (meaning outside) and ‘Genesis’ (meaning creation). Hence, ‘exogenetic’ refers to forces that are created outside the earth’s surface. The exogenetic processes are controlled by static natural forces (like sun, pressure, humidity, rainfall etc.) and dynamic natural forces (like river, wind, glacier etc.). These processes work for a long time on the surface of the earth, create new sculptures and gradually change the present landforms.
Question 2.
What are the characteristics of exogenetic processes?
Answer:
The characteristics of exogenetic processes are :
i. These are slow processes.
ii. They change the current landforms.
iii. They occur by the agents like river, wind, glacier, sea waves, ground water, tides etc.
iv. These are very time consuming processes.
v. By these processes, some landforms are lowered while some landforms gain height.
vi. Landforms are changed into smooth graded profiles.
vii. The sun and the atmosphere are the main sources of energy.
viii. Slope plays an important role.
Question 3.
Describe briefly the exogenetic processes of landform creation.
Answer:
i. Degradation: The processes which result in lowering the height of high landforms are called degradation processes.
Result : The primary landforms (mountains, hills, plateaus etc.) are transformed into secondary landforms.
Processes: Weathering, mass wasting, erosion.
ii. Aggradation : The processes which result in increasing the height of landforms by filling up of lowlands, basins or depressions are called aggradation processes.
Result : Formation of loess, alluvial cones and fans, flood plains, natural levee, delta, moraines, drumlins, out wash plains etc.
iii. Biological processes: The exogenetic processes that create new landforms with the interference of man, animals and plants are called biological processes.
Question 4.
Compare and contrast between weathering and gradation.
Answer:
| Topic | Weathering | Gradation |
| i. Definition | Breaking and fragmentation of rocks and lying in situ. | Attaining of a smooth profile by erosion, transportation and deposition of earth material. |
| ii. Energy | Static sources of energy like heat, pressure humidity, rainfall etc. | Both static and dynamic sources of energy like river, wind, glacier, sea waves etc. |
| iii. Source of energy | Solar energy and weather elements. | Static and dynamic natural sources of energy. |
| iv. Process | Mechanical, chemical and biological weathering. | Degradation, aggradation and biological process. |
| (v. Nature of process | Static process. | Both static and dynamic. |
| vi. Movement of materials | Rocks are fragmented but are not moved. | Rocks are fragmented, eroded or moved and deposited elsewhere. |
| vii. Result | Main process of soil formation | Process of landscape formation and graded land profile. |
Question 5.
Compare and contrast between degradation and aggradation.
Answer:
| Topic | Degradataion | Aggradation |
| i. Definition | Process of erosion and removal of earth’s material and reducing the height of original landform. | Process of deposition of eroded material in lowlands and depressions and increasing the height of original landforms. |
| ii. Process | Weathering, erosion and mass wasting. | Deposition by dynamic natural forces like river, wind, glacier, sea waves etc. |
| iii. Height | Original height of landform reduces. | Original height of landform increases. |
| iv. Denudation | Denudation occurs and new surface of landform is exposed. | Original land surface is covered up due to deposition. |
| v. Landforms | Monadnock, inselberg, mesa, butte, dhand, canyon, blow hole etc. | Loess, alluvial cones and fans, flood plains, delta, moraines etc. |
Question 6.
What is the inter-relationship between weathering, erosion and denudation?
Answer:
Weathering is the process by which rock materials are broken and fragmented by different weather elements. These fragmented materials lie in situ and are not moved. Erosion is the process by which the broken and fragmented rock materials are removed from one place to another by the dynamic forces of nature like river, wind, glacier, sea waves etc. Weathering and erosion are inter dependent. Unless weathering occurs, erosion cannot start. Unless erosion removes the rock debris, further weathering cannot occur.
Denudation is the process by which the outer cover of the landform is removed and a new surface comes out. This cannot occur unless weathering and erosion occur. Hence all these processes are inter dependent.
Question 7.
Give a brief description of gradation.
Answer:
The term ‘gradation’ comes from the word ‘grade’. This was first used by G. K. Gilbert in 1876. ‘Gradation’ means ‘to bring in to a common or uniform level land’. The landforms created mainly by the geotectonic forces (mountains, hills, plateaus, plains, etc.) are acted upon by various exogenetic forces (weathering, mass wasting, erosion etc by different agents). These landforms one highered, lowered or smoothened by the process of aggradation or degradation. Thus the forces which help to bring about this action are called gradational forces.
Question 8.
What is the inter relationship between degradation, aggradation and gradation?
Answer:
The processes of degradation and aggradation work hand in hand in case of changing of landscape. Degradation refers to the process of lowering of existing landforms by weathering and erosion of weathered materials. Aggradation refers to the deposition of these eroded materials in depressions and lowlands, thus raising the altitude of the place. Deposition is an evitable outcome of erosion. Hence the processes of degradation and aggradation go hand in hand. The result of aggradation and degradation is lowering and smoothening of high and rugged landforms and raising of lowlands. Thus a graded or uniform landform is formed by the process of gradation. Hence, it is said that gradation cannot occur without aggradation and degradation. All these three processes are inter-related.
Question 9.
Why is the degradation process called a destructive process ?
Answer:
The process by which highlands including high mountains, hills, plateaus are lowered by different erosional process of river, wind, glacial, seawaves and also by masswasting, denudation to achieved a equllibrium position is called degradation. The original heights of the surface forms are eroded and lowered down by degradation.So that, the said process is also called a destructive process.
Answer in details : 5 Marks
Question 1.
Discuss briefly about exogenetic processes of landform creation.
Answer:
[All exogenetic processes have been explained part by part earlier].
Question 2.
Discuss the role of exogenetic processes in creation of landforms.
Answer:
Landforms created by exogenetic processes are mainly formed by degradation or aggradation.
i. Degradation : By this process, the primary landforms like mountains, hills and plateaus are lowered to form secondary landforms.
Landforms : (a) Degradation starts with formation of regolith on the land surface.
(b) High mountains are reduced to plateaus and finally plains.
(c) Plateaus are dissected and finally reduced to plains.
(d) Slope of land reduces and merges with the sea level.
(e) Landforms created are – gorges, canyon, pot holes, waterfalls, plunge pools, interlocking spurs, gour, zeugen, yardang, ventifact, inselberg etc.
ii. Aggradation : By this process, landforms are created by deposition of eroded materials in low lands and depressions.
Landforms : Flood plains, deltas, loess, outwash plains etc.
Question 3.
Discuss the characteristics of exogenetic processes of landform creation.
Answer:
i. Nature : Very slow process except for landslide and flood.
ii. Place : Occurs mostly on the land surface and sub-surface of the earth.
iii. Forces : Weathering, erosion, mass wasting agents along with river, wind, sea waves, glaciers, tides etc.
iv. Processes : (a) Weathering, erosion and deposition of materials by river, glacier, wind, sea waves, ground water etc.
(b) Mass wasting due to gravitational force.
(c) Mechanical, chemical and biological weathering.
v. Result : Reduction of original landmass to simple, plain, smooth landform mostly by reducing height and some depositions.
Question 4.
Discuss the processes of landform creation by exogenetic processes.
Answer:
i. Degradation : The processes which result in lowering the height of high landforms are called degradation processes.
Result : The primary landforms (mountains, hills, plateaus etc.) are transformed into secondary landforms.
Processes : Weathering, mass wasting, erosion.
ii. Aggradation : The processes which result in increasing the height of landforms by filling up of lowlands, basins or depressions are called aggradation processes.
Result : Formation of loess, alluvial cones and fans, flood plains, natural levee, delta, moraines, drumlins, out wash plains etc.
iii. Biological processes : The exogenetic processes that create new landforms with the interference of man, animals and plants are called biological processes.
Question 5.
Discuss the role of aggradation and degradation processes in formation of new landforms.
Answer:
Landforms created by exogenetic processes are mainly formed by degradation or aggradation.
i. Degradation : By this process, the primary landforms like mountains, hills and plateaus are lowered to form secondary landforms.
Landforms : (a) Degradation starts with formation of regolith on the land surface.
(b) High mountains are reduced to plateaus and finally plains.
(c) Plateaus are dissected and finally reduced to plains.
(d) Slope of land reduces and merges with the sea level.
(e) Landforms created are – gorges, canyon, pot holes, waterfalls, plunge pools, interlocking spurs, gour, zeugen, yardang, ventifact, inselberg etc.
ii. Aggradation : By this process, landforms are created by deposition of eroded materials in low lands and depressions.
Landforms : Flood plains, deltas, loess, outwash plains etc.
Question 6.
Discuss the role of the different agents of gradation in formation of new landforms.
Answer:
The various agents of gradation work on the existing landforms created on the surface of the earth and bring about changes in relief. The role of the different agents of gradation are discussed below :
i. River : River is the most powerful agent of gradation. It erodes the valleys and basins through the processes of abrasion, attrition, solution and hydraulic action. The various landforms created due to erosion are-gorge, canyon, waterfall, plunge pool, interlocking spurs etc. The landforms created due to deposition of materials are – alluvial cone, alluvial fan, natural levee, delta, sand bar etc.
ii. Wind : Wind is an effective agent of gradation in arid regions. It erodes through the processes of abrasion, attrition, friction etc. Landforms produced due to wind erosion are – dhand, blow out, inselberg, gour, zeugen, yardang, dreikanter, ventifact etc. Landforms created due to deposition by wind are sand dunes, loess, etc.
iii. Glacier : Glaciers erode in cold regions by the processes of abrasion, attrition and plucking. Landforms created by glacial erosion are – corrie or cirque, pyramid peak, hanging valley, roche moutonnee. Glaciers deposit materials after they melt in warmer regions. Landforms created by glacial depositions are moraines, drumlin, esker, kame, outwash plains etc.
iv. Sea waves : Sea waves erode with the force of the waves by the processes of abrasion, attrition, collision, friction etc., creating landforms like sea escarpments, sea caves, blow holes, pillars, stumps, stacks etc. The depositional landforms created by waves are- gulfs, bays, sand bars, spits, tombolos, beaches etc.
v. Ground water : Ground water generally erodes through a very slow process mainly by solution in limestone regions. Landforms thus created are – sink hole, swallow hole, uvala, polje, terrarosa etc. The materials dissolved in the water may get deposited to form features like stalactite, stalagmite, pillars etc.
vi. Mass wasting : In hilly regions, landslides and mass wasting may reduce height of the hills and mountains.
vii. Others : Sudden occurrence of tsunami, flood etc. also contribute to degrade or aggrade a region.
Question 7.
What are the results of degradation of landforms ?
Answer:
Degradation is the process of reduction of landforms gradually, thus producing newer landforms. The results of degradation are :
i. Creation of regolith on the earth’s surface, which leads to the formation of soil.
ii. High mountains or hills are eroded and lowered to form plateaus. They can be further lowered to form plains.
iii. Rugged plateaus are first dissected by the numerous rivers flowing through them. Later, they are reduced to plains.
iv. Higher plains are further reduced to form lower plains with lesser undulations and minimum slope.
v. The ruggedness of landforms is smoothened and a uniform slope is formed.
Multiple Choice Questions (MCQ) 1 Mark
Question 1.
Landform building processes can be broadly divided into – parts.
(A) 2
(B) 3
(C) 4
(D) 5
Answer:
(A) 2
Question 2.
The exogenic processes are
(A) Sudden
(B) Medium fast
(C) Slow
(D) Very slow
Answer:
(D) Very slow
Question 3.
The term ‘grade’ was first used by-
(A) Thornbury
(B) Morris Davis
(C) Gilbert
(D) Prat
Answer:
(C) Gilbert
Question 4.
Which of these is an exogenic process?
(A) Earthquake
(B) Vulcanism
(C) Sea waves
(D) None of these
Answer:
(C) Sea waves
Question 5.
The process of lowering the height of landforms is
(A) Degradation
(B) Aggradation
(C) Gradation
(D) None of these
Answer:
(A) Degradation
Question 6.
Which of these is an example of aggradation ?
(A) Pot hole
(B) Waterfall
(C) Canyon
(D) Delta
Answer:
(D) Delta
Question 7.
Which exogenic process results in formation of flood plains ?
(A) Aggradation
(B) Degradation
(C) Gradation
(D) Biological weathering
Answer:
(A) Aggradation
Question 8.
What happens to the slope of land due to aggradation ?
(A) Remains same
(B) Becomes nil
(C) Reduces
(D) Increases
Answer:
(C) Reduces
Question 9.
Degradation and aggradation together result in
(A) Erosion
(B) Weathering
(C) Gradation
(D) Mass wasting
Answer:
(C) Gradation
Question 10.
What happens to the slope of land due to degradation ?
(A) Reduces
(B) Increases
(C) Remains static
(D) Becomes zero
Answer:
(A) Reduces
Question 11.
Which one is not a process of degradation?
(A) River erosion
(B) River deposition
(C) Weathering
(D) Mass wasting
Answer:
(B) River deposition
Question 12.
An agent of exogenic process is
(A) Earthquake
(B) Vulcanism
(C) Earth movement
(D) River
Answer:
(D) River
Question 13.
Height of landforms is increased by
(A) Degradation
(B) Aggradation
(C) Weathering
(D) Lands Lide
Answer:
(B) Aggradation
Question 14.
Exogenic processes mainly result in –
(A) Aggradation
(B) Degradation
(C) Aggradation and degradation
(D) None of these
Answer:
(C) Aggradation and degradation
Question 15.
The process that creates a balance between erosion, transportation and deposition is –
(A) Weathering
(B) Mass wasting
(C) Atmospheric process
(D) Gradation
Answer:
(D) Gradation
Question 16.
Gradation results due to-
(A) Erosion
(B) Deposition
(C) Weathering
(D) All of these
Answer:
(D) All of these
Question 17.
A landform created by agradation is –
(A) Fault
(B) Exfoliation
(C) Loess
(D) Mass wasting
Answer:
(C) Loess
Question 18.
The process of increasing height of a landmass is-
(A) Aggradation
(B) Degradation
(C) Continental movements
(D) Orogenic movements
Answer:
(A) Aggradation
Question 19.
Geologists Chamberlen and Salisbury (1904) have remarked exogenic processes as –
(A) Erosion process
(B) Abrasion process
(C) Biological process
(D) Gradation process
Answer:
(D) Gradation process
Question 20.
Heat, air pressure, humidity, river, wind, glacier etc. are agents of –
(A) Endogenic processes
(B) Non-earth processes
(C) Convectional processes
(D) Exogenic processes
Answer:
(D) Exogenic processes
Question 21.
Gradation is a – process.
(A) Atmospheric
(B) Endogenic
(C) Exogenic
(D) Spacial
Answer:
(C) Exogenic
Question 22.
Alluvial plains are created by –
(A) Gradation
(B) Aggradation
(C) Radiation
Weathering
Answer:
(A) Gradation
Question 23.
The work of exogenic processes is –
(A) Constructive
(B) Destructive
(C) Both constructive and destructive
(D) None of these
Answer:
(C) Both constructive and destructive
Question 24.
Source of energy of all exogenic processes is –
(A) Sun
(B) Space
(C) Earth’s magnetic field
(D) Endogenic forces
Answer:
(A) Sun
Question 25.
An important exogenic process is –
(A) Tension
(B) Compression
(C) Expansion
(D) Erosion
Answer:
(D) Erosion
Question 26.
Exogenic processes depend on – forces.
(A) Earth’s interior
(B) Forces working on earth’s surface
(C) Geothermal
(D) Earthquake
Answer:
(B) Forces working on earth’s surface
Question 27.
River, wind, glacier, sea waves, etc. are agents of – processes.
(A) Endogenic
(B) Exogenic
(C) Spacial
(D) None of these
Answer:
(B) Exogenic
Question 28.
An agent of degradation is –
(A) Weathering
(B) Biological action
(C) Gradation
(D) Subduction
Answer:
(A) Weathering
Question 29.
An agent of agradation is –
(A) Tides
(B) Tsunami
(C) Flowing water
(D) Sea waves
Answer:
(C) Flowing water
Question 30.
The process by which the landforms on the earth’s surface tends to reach a balanced profile is called –
(A) Aggradation
(B) Degradation
(C) Subduction
(D) Gradation
Answer:
(D) Gradation
Question 31.
The process by which natural agents reshapes the existing landscapes over the earth’s surface is known as
(A) Exogenetic
(B) Endogenetic
(C) Orogenetic
(D) Epirogenetic process
Answer:
(A) Exogenetic
Question 32.
The process by which the earth surface increases is –
(A) Aggradation
(B) Degradation
(C) Weathering
(D) Denudation
Answer:
(A) Aggradation
Fill in the blanks : 1 Mark
1. The process by which the natural forces create landforms on the earth’s surface are called ________.
2. The sources of energy for exogenic processes apart from gravitation are _______ and ________.
3. The process of aggradation and degradation together result in a _______ profile.
4. The limit of degradation or erosion is marked by the nearest ________.
5. Delta, sand beach, flood plain etc. are examples of _______ process.
6. The main controlling factor of aggradation is ________.
7. The term ‘gradation’ was first used by ________.
8. The process of _______ brings a balance between erosion, transportation and deposition.
9. An example of an endogenetic process of landform formation is ________.
10. The process of modifying landforms by combined action of erosion and weathering called ________.
Answer:
1. Exogenic processes
2. Sun and atmosphere
3. Graded
4. Sea level
5. Aggradation
6. Slope
7. Gilbert
8. Gradation
9. Plate movement
10. Denudation
State True or False : 1 Mark
1. Filling up of lowlands is a process of aggradation or deposition. [ ]
2. Lowering of height of highlands occurs due to degradation. [ ]
3. The main source of energy of exogenic process is the sun. [ ]
4. The main agent of gradation is river. [ ]
5. Loess plains are formed by degradation. [ ]
Answer:
1. T
2. T
3. T
4. T
5. F
Answer in few words : 1 Mark
Question 1.
What are the processes of landform creation known as a whole?
Answer:
Earth movements.
Question 2.
Name an agent of exogenic process.
Answer:
River or glacier or wind.
Question 3.
Which process is responsible for planation or formation of plains on the earth’s surface?
Answer:
Gradation.
Question 4.
What is the result of gradation?
Answer:
Planation of the landform.
Question 5.
Which process of planation results in filling up of river beds and flooding?
Answer:
Aggradation.
Question 6.
Name the processes that cause degradation.
Answer:
Erosion, transportation and mass wasting,
Question 7.
Name the main source of energy for the exogenetic process.
Answer:
Sun.
Question 8.
What is the process of removal of weathered rocks to other places ?
Answer:
Erosion.
Question 9.
What is the process of filling of loose materials like rocks and soil along the slope?
Answer:
Mass wasting.
Question 10.
What type of weathering is most prominent is desert region?
Answer:
Mechanical weathering.
Question 11.
Match the following :
Answer:
| A column | B column |
| 1. Endogenetic force | (a). Weathering |
| 2. Exogenetic force | (b). Delta |
| 3. Aggeadation | (c). main source is sun |
| 4. Degradation | (d). Beneath the surface |