Question 1

What shapes the Earth’s surface?

Source: NCERT, chapter 2, PDF page(s) 1.

Accepted Answer

The Earth’s surface is shaped by processes working both inside the planet and at its surface. Internal crustal movement, folding, faulting and volcanic activity build or reorganise major relief such as mountains, valleys and ocean basins. At the surface, weathering breaks rock down in place through physical, chemical or biological processes. Erosion removes and transports material, while deposition accumulates it elsewhere. Running water, waves, glaciers, wind and underground water are important agents of this continuing change. The processes interact: raised or deformed land can later be worn down, while transported material helps build depositional features. Surface formation therefore involves both construction and reshaping, not plate movement alone, and deposition is not another name for erosion. — The draft’s main list was broadly sound, but its explanation included deposition within erosion. The correction distinguishes rock breakdown, removal/transport and accumulation, while retaining both internal and external processes and all five named agents of gradation.

Question 2

What is plate tectonics? What are the effects of plate movement?

Source: NCERT, chapter 2, PDF page(s) 1.

Accepted Answer

Plate tectonics is the theory explaining the slow movement of lithospheric plates: rigid pieces containing the crust and uppermost mantle. They move over the hot, mobile asthenosphere; this does not mean that the entire mantle is liquid.

Their effects depend on how plates interact:

- **Convergence:** continental collision can form fold mountains such as the Himalaya; an oceanic plate descending beneath a continental plate is associated with earthquakes and volcanic activity.
- **Divergence:** plates separate, allowing magma to form new crust and features such as the Mid-Atlantic Ridge.
- **Transform movement:** plates slide past one another without creating or destroying crust, producing earthquakes such as those associated with the San Andreas Fault.

These movements shape major relief and help explain why many earthquakes and volcanoes occur near plate boundaries, especially around the Pacific Ring of Fire. — The draft incorrectly described crust moving into plates and did not clearly separate the boundary mechanisms. The corrected definition uses the actual lithosphere/asthenosphere labels, preserves the mostly-solid mantle qualification, and answers both the definition and effects parts with the source’s named examples.

Question 3

How are landforms formed and how are they classified?

Source: NCERT, chapter 2, PDF page(s) 1.

Accepted Answer

Landforms develop through internal crustal movements and external weathering, erosion and deposition. They can be described by their form—such as mountains, plateaus, plains or valleys—and grouped by the dominant processes illustrated in this chapter:

| Process or agent | Source examples and formation |
| --- | --- |
| Tectonic movement | Continental collision produces fold mountains |
| Running water | Erosion cuts valleys; deposition builds deltas |
| Waves and currents | Coastal erosion produces cliffs, caves and arches |
| Glaciers | Erosion widens U-shaped valleys; deposited debris forms moraines |
| Wind | Removal produces deflation hollows; deposited sand forms dunes |
| Underground water | Dissolution of soluble rock creates caves and other karst features |

These are useful process-based groups, not mutually exclusive labels for all time. A feature created by one process may later be weathered, eroded or modified by another. — The classification follows the chapter’s tectonic discussion and its water, coastal, glacial, wind and groundwater sections. It distinguishes form from origin and, importantly, erosional features from depositional deltas, moraines and dunes. It does not invent an official first-/second-/third-order taxonomy or attribute every example to plate movement.

Question 4

How are humans and other living beings connected to these landforms?

Source: NCERT, chapter 2, PDF page(s) 1.

Accepted Answer

Landforms influence the conditions and resources on which living beings depend. Fertile river deposits support crops and farming, while coastal deltas where fresh and salt water meet support varied aquatic life and fishing. Glaciers and underground rivers are important freshwater sources. For people, valleys, plains and coasts also influence settlement, transport and trade; mountains, waterfalls and caves can support recreation and cultural practices. These connections are not limited to erosion: deposited material can create productive land, while erosion or other damaging changes can remove soil and disrupt livelihoods. Thus landforms matter both as settings for plants and animals and as foundations for human food, water, work, movement and community life. — The draft concentrated on humans and erosion, leaving other living beings largely unexplained. The correction adds the source’s crop and aquatic-life examples, distinguishes deposition from erosion, and preserves freshwater, settlement, economic and cultural connections without inventing species or local observations.

Question 5

How do disasters associated with different landforms impact human lives?

Source: NCERT, chapter 2, PDF page(s) 1.

Accepted Answer

Different landforms expose communities to different hazards: unstable hillsides to landslides, steep snow-covered slopes to avalanches, areas downstream of vulnerable glacial lakes to outburst floods, and dry exposed ground to dust storms. Such events can threaten lives, homes, livestock, transport links and livelihoods. Damage to infrastructure can also isolate communities and interrupt services. The chapter’s February 2021 Chamoli example reports deaths of people and livestock, damage to buildings, roads, bridges and hydel projects, and disrupted village connections. It illustrates impacts, not proof of a particular cause for that flood. The seriousness of a disaster depends on local conditions and human exposure, so understanding the setting and planning appropriately matter. — The answer expands beyond the draft’s short earthquake/landslide list to cover the chapter’s distinct hazard settings and their consequences. It uses Chamoli only for the impacts actually reported and does not assume that it was caused by rainfall, a glacial-lake outburst or climate change.

Question 6

Pick any two plates from the map above and complete the table given below.

| Name of the plate | Continents | Ocean |
| --- | --- | --- |
| ______ | ______ | ______ |
| ______ | ______ | ______ |

Source: NCERT, chapter 2, PDF page(s) 4.
Source visual(s): Fig. 2.3. World map showing major plates and their direction of movement

Accepted Answer

Suggested method: **Method for completing both rows:** choose two different plates labelled in Fig. 2.3. Trace each plate’s boundary and identify the continent or continents and ocean areas carried within it. Do not use a continent’s coastline as though it were the plate boundary: the source distinguishes continental, oceanic and mixed plates. Copy the plate name as printed, then fill the other columns from a reliable labelled map or atlas if a geographical name is unclear.

| Name of the plate | Continents | Ocean |
| --- | --- | --- |
| First selected plate: ______ | ______ | ______ |
| Second selected plate: ______ | ______ | ______ |

Complete both rows rather than supplying one example. Keep continent names distinct from individual island names, and do not infer plate membership merely because an ocean borders the continent. This is a completion guide, not a claimed finished table. — The source supplies two blank rows and allows the learner to choose the plates. The draft supplied only one row, mixed geographical levels in the Continents column, and reversed the relationship by calling a plate part of a continent. The method preserves the full table without asserting an unverified selected pair.

Question 7

Examine the plate map (Fig. 2.3) with the earthquake and volcano map (Fig. 2.4). What correlation do you observe?

Source: NCERT, chapter 2, PDF page(s) 4.
Source visual(s): Fig. 2.3. World map showing major plates and their direction of movement; Fig. 2.4. Map showing the distribution of earthquakes and volcanoes

Accepted Answer

The earthquake and volcano locations in Fig. 2.4 broadly follow many of the plate boundaries shown in Fig. 2.3, especially around the Pacific Ring of Fire. The plate map supplies boundaries and movement directions; it does not itself plot earthquake or volcano occurrences. The relationship is explained by plate interactions: subduction is associated with earthquakes and volcanism, divergence allows new crust to form, and transform movement mainly produces earthquakes. The correlation is therefore a broad spatial association, not an exact one-to-one match at every boundary. The maps do not provide a calculated activity rate or prove that every earthquake and volcano lies on a boundary. — The draft incorrectly said both maps show concentrations of seismic/volcanic activity and implied a numerical relationship with the number of boundaries. The correction distinguishes what each map depicts and uses the chapter’s most-events statement and boundary mechanisms without inventing statistics.

Question 8

Observe the map showing the distribution of earthquakes and volcanoes (Fig. 2.4). Can you identify which continents and countries are located around the Ring of Fire with the help of an atlas or a globe?

Source: NCERT, chapter 2, PDF page(s) 5.
Source visual(s): Fig. 2.4. Map showing the distribution of earthquakes and volcanoes

Accepted Answer

The marked Ring of Fire follows the Pacific margins of **North America, South America and Asia**, continuing through the south-western Pacific island arc to **New Zealand**. Representative countries explicitly named on the supplied NCERT political map are:

| Part of the belt | Named country examples |
| --- | --- |
| Western North America | Canada, United States, Mexico |
| Western South America | Chile |
| Eastern Asia | Japan and the Pacific-facing part of Russia |
| South-western Pacific islands | New Zealand |

New Zealand is a country, not a continent. The NCERT physical atlas uses Australia as a continent name, but mainland Australia is outside the USGS map’s marked belt; that does not mean it has no earthquakes. These are identifiable examples, not an exhaustive country list, and they do not place every part of each country inside the belt. — The political atlas supplies the country names, the physical atlas supplies the continental names, and the USGS map supplies the marked geological route. Their combination resolves the original missing-reference problem without treating trench labels as country labels or substituting a Pacific-only answer for the requested identifications.

Question 9

Does India have a risk of earthquakes?

India has experienced some major earthquakes in the past, resulting in thousands of deaths. A large earthquake in a densely populated country like India can cause severe damage to life and environment. Can you find out which region is more vulnerable to earthquakes? Why do you think human lives are at risk?

Source: NCERT, chapter 2, PDF page(s) 5.
Source visual(s): Fig. 2.5. The extensive damage caused by the major earthquake in Gujarat in 2001

Accepted Answer

Part prompt-1
Yes, India has earthquake risk. The chapter states that major earthquakes have occurred in India and caused serious loss of life. Fig. 2.5 specifically identifies extensive damage from the Gujarat earthquake of 2001, providing a concrete example rather than merely a theoretical possibility. The surrounding discussion explains how plate interactions produce earthquakes and why their distribution is important. This establishes that India is exposed to the hazard, but it does not mean every place has identical risk or that a particular earthquake is imminent. The photograph and general discussion are not a modern seismic-zone classification or a prediction of the next event.

Part prompt-2
**The northern Himalayan belt** is the broad earthquake-prone region indicated by this source-map comparison. The physical atlas locates the Himalayas along India’s northern margin. The book’s simplified plate map labels the plate carrying India **Indo-Australian** and shows movement towards the **Eurasian** margin; the text connects the Himalaya with continental collision. The earthquake-origin map also indicates activity along that broad belt.

This is a qualitative identification, not a current district-level zoning or numerical risk ranking. Seismic hazard must also be distinguished from human vulnerability, which depends on exposure, buildings and preparedness. The chapter’s photograph of damage from the **Gujarat earthquake of 2001** demonstrates that damaging earthquakes are not confined to the Himalayas. Other parts of India must not be assumed earthquake-free, and these maps do not predict a future earthquake.

Part prompt-3
Human lives are at risk when earthquake-related damage affects places where people live and work. The chapter emphasises that a large earthquake in a densely populated country can cause severe harm, because many people may be exposed to damaged surroundings. The Gujarat 2001 photograph illustrates extensive damage, while the text records loss of life in past Indian earthquakes. Shaking can also trigger failure on susceptible slopes, as the landslide section explains. Risk therefore concerns both the hazardous event and the people exposed to its effects, not only the existence of a plate boundary. The source does not establish identical vulnerability everywhere or assess any individual home. — Part prompt-1
The draft’s yes was supported but left the answer almost entirely in its explanation. The correction brings the actual textbook evidence into the response and distinguishes evidence of risk from a regional ranking or an earthquake prediction.

Part prompt-2
The registered comparison now supplies the missing geographical support. It preserves the map’s Indo-Australian label, removes the unsupported Indo-Burma/single-collision addition and avoids treating a broad source-map pattern as a modern risk classification. The appendix’s Himalayan identification remains Chapter 9 evidence carried through the registered supplement, not a fabricated Chapter 2 block.

Part prompt-3
The draft repeated a regional plate-collision claim instead of focusing on why people are endangered, and it assigned a general national death statement to a particular event. The correction uses the source’s exposure, damage and slope-instability evidence without adding an unverified earthquake mechanism or casualty count.

Question 10

Look carefully at this photograph and answer the following questions:

• What do you think caused this situation?
• What could that grey powder be?
• What does it tell us about the Earth’s internal forces?

Source: NCERT, chapter 2, PDF page(s) 6.
Source visual(s): Fig. 2.6. Photograph showing the deposition by volcanic eruption

Accepted Answer

**Source-based interpretation of all three questions:**

1. **Cause:** the caption identifies deposition by a volcanic eruption, so the situation should be understood as the result of erupted material reaching and settling on the surface.
2. **Grey powder:** it could be volcanic ash deposited by the eruption. The photograph’s colour alone does not establish its exact mineral or chemical composition.
3. **Internal forces:** the chapter links volcanic activity with processes inside the Earth and plate movement. Material reaching the surface can accumulate and alter the landscape, showing that internal activity has visible surface consequences.

This is an interpretation supported by the caption and chapter context, not a laboratory identification. The supplied source does not identify the particular volcano, eruption date, quantity of material or a specific plate boundary responsible. — The draft cited the three questions rather than the caption and promoted a specific rock/glass composition to certainty. The correction uses the actual eruption caption, preserves could for the ash identification and answers the internal-forces question without inventing event details.

Question 11

Observe the photographs (Fig. 2.9) and also note the types of erosion. How are farmers affected by erosion due to water and wind?

Source: NCERT, chapter 2, PDF page(s) 9.
Source visual(s): Fig. 2.9. Erosion caused by (a) water and (b) wind

Accepted Answer

Figure 2.9(a) shows water erosion: water has cut a channel through the soil. Figure 2.9(b) shows wind erosion, with dust blowing over dry ground. Water can wash fertile topsoil away from a field, while wind can carry loose soil away, especially in dry and sandy areas. In both cases, farmers lose the fertile surface soil needed for crops to grow well. The land becomes less productive and crop yields can fall, affecting farmers' livelihoods. — The caption identifies the two agents as water and wind. The paragraph on erosion explains that material is carried away, rather than merely broken down in place. The following page explicitly links the loss of fertile topsoil to lower crop yields. The photographs illustrate erosion; they do not provide a measured rate of soil loss, a crop-yield figure, or an identifiable farm location.

Question 12

Have you heard about the Sundarbans delta? Try and explore its uniqueness and find out why it is popular with tourists.

Source: NCERT, chapter 2, PDF page(s) 13.
Source visual(s): Fig. 2.13. Sundarbans delta

Accepted Answer

The Sundarbans is a distinctive deltaic mangrove region shared by India and Bangladesh beside the Bay of Bengal. It forms part of the delta built by the Ganges, Brahmaputra and Meghna river system. Tides and river deposits shape its islands and network of creeks and waterways, supporting the world's largest mangrove forest complex.

Its combination of forest and water habitats supports remarkable wildlife, including Bengal tigers, river dolphins, estuarine crocodiles and many birds. This makes it important both ecologically and for conservation.

Visitors are attracted by the unusual mangrove landscape, scenic waterways and opportunities to observe bird life and other wildlife. UNESCO specifically describes the varied bird life along the waterways as a major attraction. This explains its tourist appeal without claiming that every visitor will see a tiger or that a visit has actually been made. — The textbook explains delta formation and identifies the Sundarbans image, but it does not provide the complete site-specific answer. The newly verified UNESCO sources establish the region, mangrove ecology, wildlife and nature-tourism appeal. The wider cross-border forest is not identical to either individual World Heritage property. Unneeded claims about rice cultivation, specific tours, visitor totals and guaranteed sightings have been removed.

Question 13

A devastating flood struck the Chamoli district in Uttarakhand in February 2021 in which many people and livestock lost their lives. There was severe damage to buildings, roads, bridges, and hydel projects, and connectivity to villages was adversely affected. Can you find out the reasons that led to the sudden and unexpected flood?

Source: NCERT, chapter 2, PDF page(s) 17.
Source visual(s): Fig. 2.20

Accepted Answer

The sudden disaster in Chamoli on 7 February 2021 began when a large mass of rock and glacier ice collapsed from the steep north face of Ronti Peak. It fell as a rock-and-ice avalanche and rapidly transformed into a highly mobile debris flow.

The moving mixture of rock, ice, water and sediment rushed through the Ronti Gad, Rishiganga and Dhauliganga valleys. It overwhelmed the river channels and downstream infrastructure, severely damaging hydropower projects and causing the destructive flood-like impacts described in the question.

This event should not be explained simply by copying the general description of a glacial lake outburst flood. The event-specific scientific investigation identifies the rock-and-ice collapse and the resulting debris-flow cascade. Claims that heavy rainfall or the failure of an expanding glacial lake caused this particular event are not established by the textbook passage or the evidence used here. — The textbook box gives the impacts but asks learners to investigate the cause. Shugar and colleagues' peer-reviewed Science study identifies the dated rock/ice collapse and its transformation into a debris flow; NASA explains the same sequence and distinguishes it from unresolved questions about what initially destabilised the rock face. The corrected answer separates the established physical sequence from hypotheses about weather or long-term warming, rather than inventing a single unproven trigger.

Question 14

Observe the landforms around your school or residence and try to identify which agent may have created them.

Source: NCERT, chapter 2, PDF page(s) 20.

Accepted Answer

Suggested method: Activity method, not a report of observations already made:

1. From a safe, accessible place near your school or residence, observe a natural landform. Record its actual location, shape, material and any visible signs of water flow, deposited sand or soil, or worn rock. A sketch can help. Do not enter caves, unstable slopes, river channels or floodwater to obtain evidence.
2. Compare what you see with the chapter. A river bend or sediment deposited beside a river may suggest running water. Sand eroded and deposited in a dry landscape may suggest wind. A beach of deposited sand or pebbles suggests wave action; an undercut cliff beside the sea may suggest coastal erosion. A limestone cave may suggest groundwater dissolving rock. These are comparison clues, not claims that such features occur near your home.
3. Distinguish the agent from its action: water, wind, waves, glaciers and groundwater are agents; erosion, transportation, deposition and dissolution describe processes. For example, a beach is a deposit, whereas an undercut coastal cliff shows erosion. A cliff by itself is not enough to identify sea waves as its cause.
4. Make a record with the headings: Actual landform and place | Visible evidence | Probable agent | Process | Reason for the identification. Fill it only with your own observations. If evidence is insufficient, record the uncertainty and discuss it with your teacher instead of guessing. Do not treat a road cutting or other clearly human-made excavation as proof of a natural agent. — This question needs observations from the learner's surroundings, which have not been supplied. The chapter provides comparisons: p10-b0 identifies the main agents and groundwater dissolution; p10-b4 and p12-b2 explain river erosion and deposition; p13-b5 describes beach deposition; and p14-b9 describes erosion along a coast. The method corrects the draft's loose use of processes as agents and its suggestion that any cliff could establish coastal erosion, without inventing local landforms or claiming fieldwork was completed.

Question 15

Complete the exercises given at the end of each type of disaster with the help of newspapers, atlases, and books. Make a list of disaster-prone areas from India and the world and enlist mitigation measures quoting recent examples.

Landslides
Prone areas: ______
Mitigation measures: ______
Recent examples: ______

Avalanches
Prone areas: ______
Mitigation measures: ______
Recent examples: ______

GLOFs
Prone areas: ______
Mitigation measures: ______
Recent examples: ______

Dust Storms
Prone areas: ______
Mitigation measures: ______
Recent examples: ______

Source: NCERT, chapter 2, PDF page(s) 20, 21, 22, 23, 24.
Source visual(s): Fig. 2.27. A landslide; Fig. 2.28. An avalanche; Fig. 2.29. A GLOF; Fig. 2.30. A dust storm

Accepted Answer

The following are representative source-supported entries, not an exhaustive list of hazardous places. The recent examples are selected from 2023-2025; older evidence is used only to establish some geographical examples. The mitigation measures describe the work of responsible authorities and qualified professionals, not activities for students to carry out.

### Landslides
**Prone areas:** In India, susceptible slopes occur in the Himalayas and north-eastern hills, and in the Western Ghats and Nilgiri Hills. A world example is the unstable hillside terrain near Oso, Washington, USA, where landsliding has been documented.

**Mitigation measures:** Use hazard mapping and professional site investigations to guide land-use planning and the location of buildings and infrastructure. Monitor identified unstable slopes and rainfall, maintain location-specific early-warning systems, and communicate warnings and preparedness plans to the communities at risk.

**Recent example:** On 30 July 2024, the Mundakkai-Chooralmala landslide in Wayanad, Kerala, developed into a long-runout debris flow with flash flooding, erosion and sediment deposition. The 2014 Oso event establishes the world-area example above; it is not being labelled a recent event in this selection.

### Avalanches
**Prone areas:** In India, examples include snow-covered Himalayan slopes and avalanche paths in Uttarakhand, Himachal Pradesh, and Jammu and Kashmir. Outside India, the French Alps provide a documented example of avalanche terrain.

**Mitigation measures:** Map avalanche starting zones, tracks and run-out areas and use these maps in land-use and infrastructure planning. Professional agencies monitor snow, terrain and weather to support forecasting and warnings. Where a detailed assessment requires protective works for infrastructure, qualified specialists design them; they are not student projects.

**Recent examples:** The retrieved study documents a Gulmarg avalanche in Jammu and Kashmir in 2024 and a Mana avalanche in Uttarakhand in 2025. These examples are given at the year precision verified in that source; no unverified exact day or casualty count is added.

### GLOFs
**Prone areas:** In India, examples include glacial-lake basins and exposed downstream valleys in the Sikkim Himalaya, such as the South Lhonak-Teesta setting. World examples include Tsho Rolpa in Nepal's Rolwaling Valley and Imja Lake in Nepal's Everest region, with potentially exposed downstream areas.

**Mitigation measures:** Carry out site-specific assessments of the lakes, surrounding slopes and downstream exposure. Combine appropriate lake and river monitoring with maintained early-warning systems, warning communication, local awareness and preparedness planning. These require responsible agencies, specialists and community participation; do not attempt lake, dam or moraine interventions.

**Recent example:** The South Lhonak lake outburst in Sikkim caused destructive downstream Teesta flooding in October 2023. The two retrieved studies date the initiating cascade/event to 3 and 4 October respectively, so the example is identified by month without inventing a timing reconciliation. This was a glacial-lake outburst, distinct from the rock-and-ice avalanche and debris-flow mechanism of the February 2021 Chamoli event.

### Dust Storms
**Prone areas:** Indian examples include the Thar Desert/Rajasthan dust-source region and downwind parts of north-central India. World examples include the seasonally dry Hamun-wetlands region around the Iran-Afghanistan border and downwind areas extending into Pakistan.

**Mitigation measures:** Weather services and disaster authorities should monitor conditions, issue timely forecasts and warnings, and maintain risk knowledge and monitoring services. Clear official warnings need to reach affected communities and be linked to response preparedness, including planning for reduced visibility and harmful air quality.

**Recent example:** A dust episode affected Iran, Afghanistan and Pakistan in September 2023. NASA documented thick dust plumes on 22 September and tracked dust transport during September 18-25. The observation date is not presented as a guessed storm-onset time. The 2018 Indian dust episode cited for Rajasthan's geographical role is not relabelled as a recent example. — All four source worksheets and all twelve response fields are covered. The chapter supplies terrain and process explanations; the new question-scoped supplement supplies the previously missing geographical examples, mitigation evidence and dated cases. Official NDMA guidance supports risk mapping, expert planning, monitoring, warning communication and preparedness. Retrieved peer-reviewed studies and NASA accounts establish the selected events and locations. No original guessed event, blasting proposal, foreign emergency number, invented local observation or claim of uniform regional danger is retained.

Shaping of the Earth's Surface

Shaping of the Earth's Surface — Study Notes

Introduction and guiding questions

Plate Tectonics - Part 1

Weathering, erosion and conservation: processes and human consequences

Practice Questions — Shaping of the Earth's Surface

All 9 Chapters in Understanding Society India and Beyond PART-I