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GeographyClass 11Natural Hazards And Disasters

Natural Hazards And Disasters | Class 11 Geography Notes

By ConceptScroll Team · Published on 17 July 2026 · 4 min read

Natural Hazards And Disasters – this guide gives you a concise, exam-ready overview of Natural Hazards And Disasters from Class 11 Geography, written by ConceptScroll editors and reviewed against the latest NCERT textbook.

Classification of Natural Disasters

This section classifies natural disasters into four broad categories based on their origin and characteristics: Atmospheric, Terrestrial, Aquatic, and Biological disasters. Atmospheric disasters include phenomena related to weather and climate such as blizzards, thunderstorms, lightning, tornadoes, tropical cyclones, droughts, hailstorms, frost, heat waves, and cold waves. Terrestrial disasters originate from land processes and include earthquakes, volcanic eruptions, landslides, avalanches, subsidence, and soil erosion. Aquatic disasters involve water bodies and include floods, tidal waves, storm surges, and tsunamis. Biological disasters are caused by living organisms such as plants and animals acting as colonizers, insects infestations, and diseases like bird flu, dengue, fungal, bacterial, and viral infections.

India, due to its vast and diverse geography, experiences almost all types of natural disasters. The classification helps in understanding the nature, causes, and management strategies for each disaster type. This systematic categorization is essential for effective disaster preparedness and mitigation planning.

📊 Diagram: Table 6.1 presents the classification of natural disasters with examples under each category, providing a clear framework for understanding different disaster types.

🔗 Connection: Prepares the foundation for studying specific natural disasters prevalent in India.

Frequently asked questions

1. Choose the right answer from the four alternatives given below. (i) Which one of the following states of India experiences floods frequently? (a) Bihar (b) West Bengal (c) Assam (d) Uttar Pradesh (ii) In which one of the following districts of Uttaranchal did Malpa Landslide disaster take place? (a) Bageshwar (b) Champawat (c) Amara (d) Pithoragarh (iii) Which one of the following states receives floods in the winter months? (a) Assam (b) West Bengal (c) Kerala (d) Tamil Nadu (iv) In which of the following rivers is the Majuli River Island situated? (a) Ganga (b) Brahmaputra (c) Godavari (d) Indus (v) Under which type of natural hazards do blizzards come? (a) Atmospheric (b) Aquatic (c) Terrestrial (d) Biological

(i) Assam (c) - Assam experiences floods frequently due to Brahmaputra and Barak rivers.

(ii) Pithoragarh (d) - Malpa Landslide disaster took place in Pithoragarh district of Uttaranchal.

(iii) Kerala (c) - Kerala receives floods in the winter months due to retreating monsoon.

(iv) Brahmaputra (b) - Majuli River Island is situated in the Brahmaputra river.

(v) Atmospheric (a) - Blizzards are atmospheric natural hazards involving severe snowstorms.

2. Answer the following questions in less than 30 words. (i) When can a hazard become a disaster? (ii) Why are there more earthquakes in the Himalayas and in the north-eastern region of India? (iii) What are the basic requirements for the formation of a cyclone? (vi) How are the floods in Eastern India different from the ones in Western India? (v) Why are there more droughts in Central and Western India?

(i) A hazard becomes a disaster when it causes significant damage to life, property, and environment.

(ii) More earthquakes occur in the Himalayas and northeast India due to tectonic plate collision and active fault lines.

(iii) Basic requirements for cyclone formation are warm sea surface temperature, high humidity, and low wind shear.

(iv) Floods in Eastern India are mainly due to heavy monsoon rains and river overflow, while Western India floods are flash floods caused by heavy localized r

3. Answer the following questions in not more than 125 words. (i) Identify the Landslide-prone regions of India and suggest some measures to mitigate the disasters caused by these. (ii) What is vulnerability? Divide India into natural disaster vulnerability zones based on droughts and suggest some mitigation measures. (iii) When can developmental activities become the cause of disasters?

(i) Landslide-prone regions in India include the Himalayan region (Uttarakhand, Himachal Pradesh, Jammu & Kashmir), the Western Ghats, and parts of Northeast India. These areas have steep slopes, fragile geology, and heavy rainfall.

Mitigation measures include afforestation, controlled construction, slope stabilization, proper drainage, and early warning systems.

(ii) Vulnerability is the susceptibility of a community or region to damage from hazards. India can be divided into drought vulnerab

Project/Activity Prepare a project report on any one of the topics given below. (i) Malpa Landslide (ii) Tsunami (iii) Odisha and Gujarat Cyclones (iv) Inter-linking of rivers (v) Tehri Dam/Sardar Sarovar (vi) Bhuj/Latur Earthquakes (vii) Life in a delta/riverine island (viii) Prepare a model of rooftop rainwater harvesting

This is a project/activity based question. Students should select one topic and prepare a detailed report or model as per the instructions. For example, for Malpa Landslide, describe the event, causes, impacts, and mitigation measures.

For rooftop rainwater harvesting, prepare a model showing collection, storage, and usage of rainwater.

No fixed answer; assessment based on completeness, accuracy, and presentation.

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