NCERT Class 11 Geography India Physical Environment: Chapter 6 — Natural Hazards and Disasters
This chapter from NCERT's India Physical Environment textbook for Class 11 introduces the concept of natural hazards and disasters. It explains that change is a fundamental law of nature, occurring gradually or swiftly, and can be localized or global. While nature's changes are value-neutral, humans perceive them as good or bad based on their impact. The chapter defines a disaster as an undesirable, largely uncontrollable event that causes significant disruption to life and property, often requiring external aid. It notes that historically, disasters were viewed as purely natural phenomena with humans as helpless victims, a perspective that is being re-evaluated. The unit will explore specific disasters like floods, droughts, earthquakes, tsunamis, cyclones, and landslides, aiming to analyze their causes, consequences, and management strategies.
Quick info
| Board | CBSE / NCERT |
|---|---|
| Class | Class 11 |
| Subject | Geography |
| Book | India Physical Environment |
| Chapter | Chapter 6 — Natural Hazards and Disasters |
| Language | English |
| PDF type | NCERT Textbook |
| Session | CBSE 2026 |
| Reading time | 3 minutes |
| Word count | 518 |
Learning outcomes
- Understand the concept of natural hazards and disasters.
- Differentiate between natural changes and human-perceived disasters.
- Define disaster and its characteristics.
- Recognize the historical perspective on disasters.
- Identify various types of natural hazards and disasters.
Vocabulary
| Word | Meaning |
|---|---|
| Tsunami | A series of large ocean waves caused by underwater earthquakes or volcanic eruptions. |
| Earthquake | A sudden violent shaking of the ground, typically causing great destruction, as a result of movements within the earth's crust. |
| Floods | An overflow of a large amount of water beyond its normal confines, especially over what is normally dry land. |
| Droughts | A prolonged period of abnormally low rainfall, leading to a shortage of water. |
| Cyclones | A storm characterized by a rapid, inward spiral of winds rotating about a center of low atmospheric pressure. |
| Landslides | The sliding down of a mass of earth or rock from a mountain or cliff. |
| Disaster | An undesirable occurrence resulting from forces largely outside human control, causing serious disruption of life and property. |
| Natural Hazards | Events or phenomena that originate from natural processes of the Earth and can cause damage or loss of life. |
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Practice questions
- What is the difference between a natural change and a disaster from a human perspective? Answer: Natural changes are value-neutral from nature's perspective, but humans perceive them as good or bad based on their impact. Disasters are specifically undesirable and disruptive natural changes.
- Define the term 'disaster' as given in the chapter. Answer: A disaster is an undesirable occurrence resulting from forces largely outside human control, striking quickly with little or no warning, causing or threatening serious disruption of life and property, and requiring mobilization of efforts beyond normal emergency services.
- Give examples of changes that are considered good and bad. Answer: Good changes include the change of seasons and ripening of fruits. Bad changes include earthquakes, floods, and wars.
- What was the historical view of geographical literature regarding disasters? Answer: Historically, geographical literature viewed disasters as a consequence of natural forces, with humans treated as innocent and helpless victims.
Practice MCQs
Q1. Which of the following is considered a 'bad' or undesirable change?
Explanation: Earthquakes are listed as examples of undesirable changes that are considered bad and have haunted humankind.
Q2. According to the chapter, change is considered the law of:
Explanation: The text explicitly states, 'Change is the law of nature.'
Q3. From nature's perspective, changes are described as:
Explanation: The chapter mentions, 'From the perspective of nature, changes are value-neutral (these are neither good nor bad).'
Q4. Which of the following is NOT an example of a sudden and swift change?
Explanation: Evolution of landforms is given as an example of a gradual or slow process, unlike volcanic eruptions, tsunamis, and lightning.
Q5. What does a disaster require in terms of emergency services?
Explanation: The definition of disaster includes the need for 'mobilisation of efforts in excess of that which are normally provided by statutory emergency services'.
Frequently asked questions
What is the main focus of Unit IV in the India Physical Environment textbook?
Unit IV focuses on Natural Hazards and Disasters, covering their causes, consequences, and management.
What are some examples of natural disasters mentioned in the chapter?
The chapter mentions floods, droughts, earthquakes, tsunamis, cyclones, and landslides as examples of natural disasters.
How does the chapter define a disaster?
A disaster is defined as an undesirable occurrence, largely outside human control, that strikes quickly, causes serious disruption to life and property, and requires extraordinary emergency efforts.
Is change always considered bad?
No, change is a natural process. While some changes like natural disasters are considered bad and feared by humans, others like the change of seasons are seen as good.
What was the traditional view of humans in relation to natural disasters?
Traditionally, geographical literature viewed humans as innocent and helpless victims in front of the mighty forces of nature during disasters.
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NCERT Class 11 Geography — India Physical Environment — Chapter 6 — Natural Hazards and Disasters. Verified by NCERT Help Editorial Team. Reviewed on 29 Jul 2026. Last updated 10 Aug 2026.