Shaping of the Earth’s Surface – Complete Questions and Activities
Short Introduction
The Earth’s surface is constantly changing. Some changes are caused by forces originating inside the Earth, while others are caused by processes operating on its surface. Plate movements build mountains, generate earthquakes, produce volcanic activity, and help create ocean basins. At the same time, weathering, erosion, transportation, and deposition continuously reshape existing landforms.
Chapter 2, Shaping of the Earth’s Surface, explains the structure of the Earth, plate tectonics, plate boundaries, earthquakes, volcanoes, weathering, erosion, agents of gradation, river landforms, coastal features, glacial landforms, wind-created features, underground-water landforms, and landform-related disasters. The chapter ends with 15 questions and activities, which are answered below.
Quick Information Box
| Particular | Details |
|---|---|
| Class | Grade 9 |
| Subject | Social Science – Geography |
| Book | Understanding Society: India and Beyond, Part 1 |
| Chapter | Chapter 2 |
| Chapter Name | Shaping of the Earth’s Surface |
| Major Theme | Formation and transformation of landforms |
| Internal Processes | Plate movement, folding, faulting, earthquakes, volcanism |
| External Processes | Weathering, erosion, transportation and deposition |
| Major Agents | Running water, waves, glaciers, wind and groundwater |
| Major Hazards | Earthquakes, volcanic eruptions, landslides, avalanches, GLOFs and sandstorms |
| Learning Resource | www.mymockmate.com |
Concepts Used – Topics Covered
The chapter covers the following important concepts:
- Internal and external forces shaping the Earth
- Structure of the Earth
- Crust, mantle and core
- Lithosphere and asthenosphere
- Theory of plate tectonics
- Continental, oceanic and mixed plates
- Convection currents
- Convergent plate boundaries
- Divergent plate boundaries
- Transform plate boundaries
- Earthquake and volcano distribution
- Pacific Ring of Fire
- Weathering
- Physical, chemical and biological weathering
- Erosion and deposition
- Soil erosion and conservation
- Agents of gradation
- Running-water landforms
- Waterfalls, meanders and deltas
- Coastal erosion and deposition
- Beaches, cliffs, caves, arches and stacks
- Glacial erosion and deposition
- U-shaped valleys, cirques, arêtes and moraines
- Wind erosion and deposition
- Yardangs, deflation hollows and dunes
- Underground water and Karst topography
- Caves, stalactites, stalagmites and sinkholes
- Landslides
- Avalanches
- Glacial Lake Outburst Floods or GLOFs
- Sandstorms
- Disaster mitigation
Important Formulas and Conceptual Relationships
This chapter does not contain conventional mathematical formulas. Students should remember the following conceptual relationships:
Lithosphere = Crust + Uppermost Part of Mantle
Plate Movement ← Convection Currents in the Mantle
Landform Development = Internal Forces + External Forces
Gradation = Erosion + Transportation + Deposition
Weathering = Breakdown of Rock at or near its original location
Erosion = Wearing Away + Removal + Transportation of Material
River Process = Erosion → Transportation → Deposition
Karst Topography = Chemical Weathering + Erosion of Soluble Rocks
Disaster Risk = Natural Hazard + Exposure + Vulnerability
Important Chapter Activities with Solutions
Activity 1: LET’S MAP – Complete the Plate Table
The chapter asks students to select any two plates from the world plate map and identify the continents and oceans associated with them.
Sample Answer
| Name of Plate | Continent(s) | Ocean |
|---|---|---|
| Indo-Australian Plate | India and Australia | Indian Ocean |
| South American Plate | South America | Atlantic Ocean |
Explanation
The map shows that tectonic plates do not always correspond exactly to continents. A plate may carry continental crust, oceanic crust, or both. This is why some plates extend beneath both land and ocean.
Activity 2: What correlation exists between plate boundaries and the distribution of earthquakes and volcanoes?
Answer
There is a strong correlation between plate boundaries and the distribution of earthquakes and volcanoes.
Step-by-Step Explanation
Step 1: Observe the plate map.
The edges of tectonic plates form long zones around continents and oceans.
Step 2: Compare these zones with the earthquake map.
Most earthquake origins are concentrated near plate boundaries.
Step 3: Compare with volcano locations.
Most active volcanoes also occur along or near plate margins.
Step 4: Examine the Pacific Ocean.
The margins of the Pacific Plate have a particularly high concentration of earthquakes and volcanoes. This zone is known as the Pacific Ring of Fire.
Conclusion
The movement and interaction of plates create stress, fractures, subduction and magma movement. Therefore, earthquakes and volcanoes are concentrated mainly along plate boundaries.
Activity 3: Identify continents and countries around the Ring of Fire
Answer
The Pacific Ring of Fire surrounds much of the Pacific Ocean.
Important continents around it include:
- Asia
- North America
- South America
- Australia/Oceania
Countries and regions associated with the Ring of Fire include Japan, the Philippines, Indonesia, Papua New Guinea, New Zealand, Russia’s Far East, the western United States, Mexico, several Central American countries, Colombia, Ecuador, Peru and Chile.
The chapter’s earthquake-and-volcano distribution map visually shows a dense concentration of both phenomena around the margins of the Pacific Ocean.
Activity 4: Does India have a risk of earthquakes? Which regions are more vulnerable?
Answer
Yes. India faces significant earthquake risk.
More Vulnerable Regions
The most vulnerable areas include:
- Himalayan and sub-Himalayan regions;
- Northeast India;
- parts of Jammu and Kashmir and Ladakh;
- Himachal Pradesh;
- Uttarakhand;
- parts of Bihar;
- Gujarat, especially the Kutch region;
- Andaman and Nicobar Islands.
Why are these regions vulnerable?
The Himalayan region is tectonically active because of the continuing interaction between the Indian Plate and the Eurasian Plate.
Why are human lives at risk?
Human risk increases because of:
- high population density;
- poorly constructed buildings;
- settlements on unstable slopes;
- inadequate enforcement of building codes;
- narrow roads that hinder rescue;
- secondary hazards such as landslides and fires;
- limited preparedness.
The chapter uses the extensive destruction caused by the 2001 Gujarat earthquake as a visual example of earthquake impact.
Activity 5: Observe the volcanic-eruption photograph
Questions
What caused the situation? What is the grey powder? What does the photograph reveal about internal forces?
Answer
1. Cause of the situation:
The situation was caused by a volcanic eruption.
2. Grey powder:
The grey material is most likely volcanic ash mixed with fine volcanic particles.
3. What does it reveal?
It demonstrates that the Earth contains enormous internal energy. Pressure, heat and magma from inside the Earth can reach the surface through volcanic eruptions.
Volcanic activity can:
- release ash and gases;
- bury settlements;
- damage crops;
- affect air quality;
- alter landscapes;
- create new landforms.
Activity 6: How are farmers affected by water and wind erosion?
Answer
Water and wind erosion can seriously damage agriculture by removing fertile topsoil.
Water Erosion
Heavy rain and flowing water can:
- wash away topsoil;
- create rills and gullies;
- remove nutrients;
- expose plant roots;
- reduce soil depth;
- lower crop productivity.
Wind Erosion
Strong winds in dry areas can:
- carry away fine fertile particles;
- damage young crops;
- bury fields under drifting sand;
- reduce soil moisture;
- accelerate desertification.
Conservation Measures
Farmers can reduce erosion through:
- contour ploughing;
- bunding;
- terracing;
- shelter belts;
- afforestation;
- check dams;
- maintaining vegetation cover.
The chapter specifically discusses contouring, bunding, terracing and check dams as methods for slowing runoff, conserving water and reducing erosion.
Activity 7: Explore the uniqueness of the Sundarbans Delta
Answer
The Sundarbans is a vast deltaic region formed by the Ganga-Brahmaputra-Meghna river system.
Its uniqueness includes:
- an extensive network of tidal rivers and creeks;
- mangrove forests;
- islands and mudflats;
- rich biodiversity;
- adaptation of plants to saline and tidal conditions;
- an important habitat for wildlife;
- distinctive interaction between river and sea processes.
Why is it popular with tourists?
Tourists are attracted by:
- mangrove landscapes;
- boat journeys through tidal waterways;
- wildlife observation;
- birdwatching;
- natural scenery;
- distinctive deltaic culture.
The chapter includes a satellite-style image of the Sundarbans showing the complex network of channels and islands characteristic of a large delta.
Activity 8: What caused the sudden Chamoli flood of February 2021?
Answer
The chapter asks students to investigate the sudden flood in Chamoli district, Uttarakhand. A suitable school-level explanation is that the disaster was linked to a sudden high-mountain mass movement involving rock and ice, which generated a destructive flood and debris flow downstream.
Effects included:
- loss of human life;
- loss of livestock;
- damage to roads and bridges;
- damage to buildings;
- damage to hydropower infrastructure;
- disruption of village connectivity.
Learning Point
Mountain regions are vulnerable because steep slopes, unstable rocks, ice, snow and narrow valleys can combine to produce rapidly moving hazards.
Questions and Activities – Complete Solutions
The chapter’s final exercise begins by asking about internal energy, physiographic divisions, earthquake occurrence and prediction, the relation of plate movement to earthquakes and volcanoes, and diagrams of a meander and delta.
Question 1. What are the sources of energy required to cause movements associated with the internal forces of the Earth?
Answer
The movements associated with the internal forces of the Earth are driven mainly by heat energy from the Earth’s interior.
Step-by-Step Explanation
Step 1: The Earth’s interior is extremely hot.
Heat exists deep within the Earth.
Step 2: Internal heat has different sources.
Important sources include heat retained from the Earth’s formation and heat generated by the radioactive decay of elements inside the Earth.
Step 3: Heat causes movement within the mantle.
Hot material tends to rise, while relatively cooler material sinks.
Step 4: Convection currents develop.
This slow circulation helps move tectonic plates.
Step 5: Plate movements create endogenic processes.
These movements contribute to:
- folding;
- faulting;
- earthquakes;
- volcanic activity;
- mountain building;
- formation of major crustal features.
The chapter explains the connection between mantle convection and plate movement and illustrates heat movement below the crust.
Question 2. Relate various physiographic divisions studied in earlier grades with the endogenic forces responsible for their origin.
Answer
Major physiographic divisions can be related to different internal or endogenic processes.
| Physiographic Feature | Endogenic Process |
|---|---|
| Himalayas | Folding caused by convergence and collision of plates |
| Rift valleys | Faulting and crustal extension |
| Volcanic plateaus | Repeated lava flows and volcanic activity |
| Fold mountains | Compression and folding |
| Block mountains | Faulting and vertical displacement |
| Ocean basins | Plate movement and crustal processes |
Detailed Explanation
Himalayas:
They are young fold mountains formed by compression associated with the convergence of the Indian and Eurasian plates.
Rift Valleys:
These develop where crustal blocks move along faults and a section of land subsides.
Volcanic Plateaus:
Large quantities of lava may spread over wide areas in repeated eruptions, cool and solidify, creating plateau landscapes.
Conclusion
Major landforms are closely connected with folding, faulting, volcanism and tectonic plate movements.
Question 3. Why and where do earthquakes occur frequently? Is it possible to predict earthquakes?
Answer
Earthquakes occur when accumulated stress within the Earth’s crust is suddenly released, producing seismic waves.
Where do they occur frequently?
They are particularly frequent:
- along tectonic plate boundaries;
- near active faults;
- in subduction zones;
- along transform boundaries;
- in tectonically active mountain belts.
The Pacific Ring of Fire is one of the world’s most active earthquake zones.
Can earthquakes be predicted?
At present, scientists cannot reliably predict the exact time, location and magnitude of an earthquake in advance.
However, scientists can:
- identify earthquake-prone zones;
- study active faults;
- monitor seismic activity;
- prepare hazard maps;
- estimate long-term probability;
- improve building safety and preparedness.
Conclusion
Exact prediction remains difficult, but scientific monitoring and disaster preparedness can greatly reduce loss of life.
Question 4. “Plate movements are responsible for the distribution of earthquakes and volcanoes.” Explain.
Answer
The statement is correct because most earthquakes and volcanoes are concentrated near tectonic plate boundaries.
At Convergent Boundaries
Two plates move towards each other. Subduction or collision may cause:
- strong earthquakes;
- volcanic activity;
- mountain formation.
At Divergent Boundaries
Two plates move apart. Magma rises through the gap and creates new crust. This produces:
- volcanic activity;
- shallow earthquakes;
- mid-ocean ridges.
At Transform Boundaries
Two plates slide past each other. Friction causes stress to accumulate and then release suddenly, producing earthquakes.
Conclusion
Because plate interactions are concentrated at boundaries, the global pattern of earthquakes and volcanoes broadly follows the pattern of tectonic plate margins.
Question 5. Draw and label a diagram of a meander and a delta.
Answer
Meander – Explanation
A meander is a winding bend in the middle or lower course of a river. The outer bank experiences stronger erosion, while sediment is deposited on the inner bank. Continued erosion and deposition make the bends more pronounced.
The chapter’s Fig. 2.11 shows a meandering river with features including the river channel, steep bank, depositional bar and an oxbow lake.
Labels to include in the diagram:
- River
- Outer bend / steep bank
- Inner bend / depositional bar
- Direction of flow
- Oxbow lake, if showing an advanced stage
Delta – Explanation
A delta develops near the mouth of a river when the river loses energy and deposits its sediment before entering a sea, ocean or lake.
Labels to include:
- Main river
- Distributaries
- Sediment deposits
- Islands or bars
- Sea
For portal publication, placing the chapter-style meander and delta diagrams near this answer would improve understanding.
Question 6. How are deforestation and erosion associated with each other? Explain.
Answer
Deforestation and erosion are directly connected because vegetation protects the soil.
Step-by-Step Explanation
Step 1: Roots bind soil particles.
Tree and plant roots hold the soil together.
Step 2: Vegetation reduces rainfall impact.
Leaves and branches intercept raindrops.
Step 3: Plant cover slows runoff.
Water moves more slowly across vegetated land.
Step 4: Deforestation removes this protection.
Bare soil becomes exposed to rain and wind.
Step 5: Erosion accelerates.
Topsoil is removed by runoff and wind.
Consequences
- loss of soil fertility;
- lower agricultural productivity;
- increased sedimentation of rivers;
- higher flood risk;
- landslides on slopes;
- desertification in dry areas.
Conclusion
Deforestation increases erosion, while afforestation and vegetation conservation help protect the land.
Question 7. Develop a plan to protect land in your local area from erosion.
Answer
A practical local erosion-control plan can be developed in five stages.
Stage 1: Identify Vulnerable Areas
Survey:
- exposed soil;
- roadside slopes;
- stream banks;
- agricultural fields;
- construction sites;
- gullies.
Stage 2: Increase Vegetation Cover
- plant native trees;
- grow grass on exposed soil;
- protect existing vegetation;
- create vegetative barriers.
Stage 3: Manage Water Runoff
- build small check dams;
- create contour trenches;
- maintain drainage channels;
- use rainwater harvesting;
- avoid uncontrolled discharge onto slopes.
Stage 4: Improve Agricultural Practices
- contour ploughing;
- bunding;
- terracing on slopes;
- crop rotation;
- mulching;
- shelter belts.
Stage 5: Community Monitoring
Schools, residents, farmers and local authorities should regularly inspect vulnerable sites and repair damaged drainage and conservation structures.
Question 8. Which disasters might occur in your region? Discuss a mitigation plan.
Sample Answer for an Inland Indian Region
Possible hazards may include:
- floods;
- droughts;
- heat waves;
- severe storms;
- lightning;
- local soil erosion.
Mitigation Plan
Before the disaster:
- identify vulnerable areas;
- prepare emergency contact lists;
- improve drainage;
- protect water bodies;
- maintain emergency supplies;
- conduct school and community drills.
During the disaster:
- follow official warnings;
- move to safe areas;
- avoid flooded roads;
- switch off electricity if required;
- assist children and elderly people safely.
After the disaster:
- return only after official clearance;
- avoid damaged structures;
- use safe drinking water;
- report hazards;
- support community recovery.
Students should adapt this answer to their own district and local hazards.
Question 9. Prepare a model of landforms created by underground water.
Answer
Students can prepare a Karst topography model using cardboard, clay, plaster or recyclable craft materials.
Features to Show
- limestone surface;
- cracks and joints;
- sinkhole or doline;
- cave;
- underground stream;
- stalactite;
- stalagmite;
- pillar or column;
- cave mouth.
Scientific Explanation
Rainwater absorbs carbon dioxide and becomes mildly acidic. When this water moves through cracks in soluble rocks such as limestone, it slowly dissolves the rock and enlarges underground passages.
Over time:
- cavities become caves;
- roof deposits form stalactites;
- floor deposits form stalagmites;
- joined deposits may form pillars;
- surface collapse or dissolution may create sinkholes.
The chapter’s underground-water section visually labels stalactites, stalagmites, pillars, cave mouths and sinkholes, making it a useful model reference.
Question 10. What precautionary measures will you take in an earthquake-prone region?
Answer
Before an Earthquake
- live in or prefer earthquake-resistant buildings;
- secure heavy furniture;
- keep heavy objects on lower shelves;
- know safe spots inside the building;
- prepare an emergency kit;
- practise evacuation drills.
During an Earthquake
Follow the principle:
Drop – Cover – Hold On
- Drop to the ground.
- Take cover under a strong table or desk.
- Hold on until the shaking stops.
Also:
- stay away from windows;
- do not use lifts;
- if outdoors, move away from buildings and electric poles;
- if driving, stop in a safe open location.
After an Earthquake
- expect aftershocks;
- check for injuries;
- avoid damaged buildings;
- check for gas leaks and electrical hazards;
- follow official instructions;
- keep roads clear for emergency services.
Question 11. Prepare a map showing landform-associated disasters that happened in the current calendar year.
Suggested Project Method
Because this activity depends on the calendar year in which the student completes the project, the map should be prepared using verified current-year information.
Steps
- Take an outline map of India or the world.
- Select landform-related disasters from the current year.
- Classify them, for example:
- earthquake;
- volcanic eruption;
- landslide;
- avalanche;
- GLOF;
- sandstorm;
- coastal erosion event.
- Mark each location with a different symbol.
- Create a legend.
- Add a short note with:
- date;
- location;
- type of hazard;
- major impact;
- associated landform.
This is best presented as a map-based project rather than a memorised written answer.
Question 12. Create a poster showing sacred or important landforms in your region and add associated folk stories.
Sample Poster Structure
Title: Our Sacred and Important Landforms
Include:
- name of the landform;
- location;
- type of landform;
- photograph or drawing;
- cultural importance;
- associated folk story or oral tradition;
- conservation message.
Suggested Closing Message
“Our landforms are part of our geography, history, culture and collective memory. Protect them for future generations.”
Students should use local examples from their own region so the activity remains authentic.
Question 13. Document a disaster that affected your region and explain its effects on human activities.
Model Case-Study Format
Title: Case Study of a Regional Natural Disaster
1. Background
Mention:
- date;
- location;
- type of disaster;
- physical causes.
2. Impact on Human Life
Discuss:
- casualties;
- injuries;
- displacement;
- health problems.
3. Impact on Agriculture
Discuss:
- crop damage;
- soil erosion;
- livestock loss;
- irrigation damage.
4. Impact on Transport
Discuss:
- damaged roads;
- disrupted railways;
- bridge damage;
- isolation of settlements.
5. Economic Impact
Discuss:
- loss of livelihood;
- business interruption;
- repair costs;
- tourism impact.
6. Lessons
Conclude with:
- early warning;
- safe construction;
- land-use planning;
- emergency preparedness;
- community awareness.
Question 14. Translate the landslide poster into your native language.
Suggested Hindi Translation Content
भूस्खलन से सावधान रहें
भूस्खलन संभावित क्षेत्रों में सतर्क रहें। भारी वर्षा के दौरान खड़ी ढलानों और अस्थिर चट्टानों से दूर रहें। पहाड़ी क्षेत्र में दरारें, झुके हुए पेड़, असामान्य मिट्टी खिसकना या पत्थरों का गिरना दिखाई दे तो सुरक्षित स्थान पर जाएँ और स्थानीय प्रशासन को सूचना दें। अफवाहों से बचें और आधिकारिक चेतावनियों का पालन करें।
Students should reproduce the complete information and safety message from the textbook poster in their native language and display it at home.
Question 15. Group Project on Water, Wind and Glacier
The class can be divided into three groups.
Group A: Water
Study:
- rainfall and runoff;
- river erosion;
- floods;
- coastal erosion;
- effects on agriculture and settlements;
- check dams;
- embankments;
- afforestation;
- floodplain management.
Group B: Wind
Study:
- wind erosion;
- sandstorms;
- desertification;
- crop damage;
- health impacts;
- shelter belts;
- vegetation cover;
- dune stabilisation.
Group C: Glacier
Study:
- glacial erosion;
- avalanches;
- GLOFs;
- downstream flooding;
- glacier monitoring;
- hazard mapping;
- early warning;
- controlled development in vulnerable valleys.
The chapter explains that GLOFs can occur when water stored in a glacial lake is suddenly released after failure of a natural ice or moraine dam, which may be weakened by factors including rapid melting, heavy precipitation, earthquakes, avalanches or landslides.
Common Mistakes
Students often make these errors:
- confusing weathering with erosion;
- writing that tectonic plates move rapidly;
- confusing lithosphere and asthenosphere;
- assuming earthquakes occur only at convergent boundaries;
- confusing meanders with deltas;
- writing that stalactites grow upward from cave floors;
- confusing erosion and deposition;
- calling every flood a GLOF;
- treating all volcanoes as identical to mud volcanoes;
- forgetting that rivers perform erosion, transportation and deposition;
- confusing U-shaped glacial valleys with V-shaped river valleys;
- drawing diagrams without labels;
- giving only the cause of a disaster without discussing impacts and mitigation.
Exam Tips
For plate tectonics questions, explain the complete sequence: internal heat → convection currents → plate movement → boundary interaction → landforms and hazards.
For comparison questions, use tables. This is especially useful for:
- weathering vs erosion;
- convergent vs divergent vs transform boundaries;
- V-shaped vs U-shaped valleys;
- stalactites vs stalagmites.
In diagram questions, use a pencil, keep labels horizontal and clearly mark the direction of river flow where relevant.
For five-mark disaster questions, use the structure:
Cause → Process → Impact → Vulnerability → Mitigation
For competency-based questions, connect landforms with human activities such as agriculture, tourism, transport, settlement, fishing, irrigation and hydroelectric power.
Practice MCQs
- The rigid outer layer consisting of the crust and upper mantle is called:
a) Core
b) Asthenosphere
c) Lithosphere
d) Magma chamberAnswer: c) Lithosphere - The semi-molten layer that permits plate movement is the:
a) Inner core
b) Asthenosphere
c) Continental crust
d) Outer coreAnswer: b) Asthenosphere - Two plates moving towards each other form a:
a) Divergent boundary
b) Transform boundary
c) Convergent boundary
d) Depositional boundaryAnswer: c) Convergent boundary - The Mid-Atlantic Ridge is associated mainly with:
a) Divergence
b) Continental collision
c) Weathering
d) Wind erosionAnswer: a) Divergence - Weathering differs from erosion because weathering:
a) always transports material
b) only occurs underwater
c) breaks rock without necessarily transporting it
d) forms only volcanoesAnswer: c) - A winding bend in a river is called:
a) Delta
b) Meander
c) Moraine
d) StackAnswer: b) Meander - A delta generally forms:
a) at the river source
b) at the mouth of a river
c) on a mountain peak
d) inside a glacierAnswer: b) at the mouth of a river - Which valley is typically formed by glacial erosion?
a) V-shaped valley
b) U-shaped valley
c) Rift valley only
d) Deltaic valleyAnswer: b) U-shaped valley - A deposit hanging from a cave roof is called:
a) Stalagmite
b) Stalactite
c) Moraine
d) YardangAnswer: b) Stalactite - Crescent-shaped sand dunes are called:
a) Barchans
b) Moraines
c) Deltas
d) CirquesAnswer: a) Barchans - The Pacific zone of frequent earthquakes and volcanoes is known as:
a) Karst Belt
b) Ring of Fire
c) Delta Belt
d) Great Rift PlainAnswer: b) Ring of Fire - A GLOF is associated with:
a) desert dunes
b) glacial lakes
c) sea caves
d) underground limestone onlyAnswer: b) glacial lakes
FAQ Section
1. What shapes the Earth’s surface?
The Earth’s surface is shaped by internal forces such as tectonic movements, earthquakes, folding, faulting and volcanism, and external processes such as weathering, erosion, transportation and deposition.
2. What is plate tectonics?
Plate tectonics is the theory that the Earth’s lithosphere is divided into large and small plates that move slowly over the weaker layer below.
3. Why do tectonic plates move?
Their movement is linked to heat-driven processes and slow convection within the Earth’s mantle.
4. What are the three main types of plate boundaries?
They are convergent, divergent and transform boundaries.
5. What is the main difference between weathering and erosion?
Weathering breaks rock down, while erosion removes and transports material.
6. What are the main agents of gradation?
Running water, glaciers, wind, waves and groundwater are major agents.
7. How does a meander form?
A meander develops through lateral erosion on the outer bank of a river bend and deposition on the inner bank.
8. Why are deltas fertile?
Rivers deposit nutrient-rich alluvial sediments in delta regions.
9. What is Karst topography?
It is a landscape formed mainly through the dissolution and erosion of soluble rocks such as limestone by underground water.
10. What is a moraine?
A moraine is an accumulation of rock fragments, soil and debris transported and deposited by a glacier.
11. Why are earthquakes difficult to predict?
Although scientists can identify hazardous zones and monitor seismic activity, they cannot reliably predict the exact time, place and magnitude of a future earthquake.
12. How can erosion be controlled?
Erosion can be reduced through vegetation cover, afforestation, contour farming, bunding, terracing, shelter belts, check dams and proper drainage management.
Prepare Better with MyMockMate
Understanding Geography becomes easier when students connect processes with diagrams and real-world examples. Instead of memorising individual landforms, understand the process behind each one: what force acts, what material is affected, whether erosion or deposition occurs, and what landform is produced.
For more NCERT solutions, chapter-wise question answers, diagram-based explanations, practice MCQs, revision resources and mock tests, visit www.mymockmate.com and strengthen your exam preparation with concept-based practice.
