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Natural Hazards and Disasters

Assam Board · Class 11 · Geography

Complete topic list for Natural Hazards and Disasters in Assam Board Class 11 Geography. Key concepts, sub-topics, and what to focus on for board exams.

78 questions25 flashcards5 concepts

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4 Topics · Assam Board Class 11 Geography

Topics in Natural Hazards and Disasters

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

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 Assam Board Class 11 Geography?
Natural Hazards and Disasters covers several key topics that are frequently asked in Assam Board 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 — Assam Board Class 11 Geography?
Understand the core concepts first, then work through the 78 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall 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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