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Natural Hazards and Disasters

CBSE · Class 11 · Geography

Quick revision notes for Natural Hazards and Disasters — CBSE Class 11 Geography. Key concepts, formulas, and definitions for last-minute revision.

78 questions25 flashcards5 concepts

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Key Topics to Revise

1

Understanding Disasters and Natural Hazards

  • Change is the law of nature - can be gradual (landform evolution) or sudden (earthquakes, tsunamis)
  • From human perspective, changes are value-loaded (good or bad), while from nature's perspective they are value-neutral
  • Disaster definition: Undesirable occurrence from forces largely outside human control, strikes quickly with little warning, causes serious disruption
2

Classification of Natural Disasters

  • Four main categories: Atmospheric, Terrestrial, Aquatic, and Biological
  • Atmospheric: Blizzards, thunderstorms, lightning, tornadoes, tropical cyclones, drought, hailstorms, heat waves
  • Terrestrial: Earthquakes, volcanic eruptions, landslides, avalanches, subsidence, soil erosion
3

Earthquakes in India

  • Most unpredictable and destructive natural disasters
  • Tectonic earthquakes most devastating with large area of influence
  • Indian plate moving 1 cm/year northward, obstructed by Eurasian plate
4

Tsunami

  • Seismic sea waves caused by sudden sea-floor movement during earthquakes/volcanic eruptions
  • Also called harbour waves, generated by vertical displacement of ocean water
  • Speed depends on water depth - faster in shallow water than deep ocean

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Full Notes

Key Concepts

Natural hazards are elements inEarthquakes result from sudden releaseTsunamis are high vertical waves causedIntense lowFloods occur when water exceeds

Frequently Asked Questions

What are the important topics in Natural Hazards and Disasters for CBSE Class 11 Geography?
Natural Hazards and Disasters covers several key topics that are frequently asked in CBSE Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Natural Hazards and Disasters — CBSE Class 11 Geography?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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