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Natural Disasters

Gujarat Board · Class 8 · Social Science

Quick revision notes for Natural Disasters — Gujarat Board Class 8 Social Science. Key concepts, formulas, and definitions for last-minute revision.

44 questions5 concepts

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Key Topics to Revise

1

Types of Natural Disasters – An Overview

  • Natural disasters are of two broad types: interior-origin and surface-origin.
  • Interior-origin disasters: Earthquake, Volcano, Tsunami.
  • Surface-origin disasters: Flood, Famine, Cyclone, Forest Fire, Landslide.
2

Earthquake

  • An earthquake is the sudden shaking or trembling of the Earth's crust.
  • It occurs due to internal disturbances – collision of tectonic plates or tremendous pressure inside the Earth.
  • Earthquake waves originate from the HYPOCENTER (also called FOCUS), which is deep below the Earth's surface.
3

Volcano

  • A volcano is an opening in the Earth's crust through which molten lava, rock fragments, ash, dust, and gases are ejected.
  • Four main reasons for volcanic eruption: (1) High temperature inside Earth, (2) Creation of magma, (3) Creation of gases and vapour, (4) Rising of magma towards Earth's surface.
  • Magma is pushed upward by gases lying beneath it and by pressurized steam/vapour from water seeping through cracks.
4

Tsunami

  • Tsunami refers to high oceanic waves created due to volcanic eruption or earthquake on the sea floor.
  • These waves have an extremely large wavelength – approximately 700 to 1600 km.
  • Tsunami waves travel with great speed and force across the ocean.

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Full Notes

Key Concepts

Natural disasters are suddenAn earthquake is sudden shakingA volcano is an openingTsunami refers to high oceanic wavesA flood is an excessive flow

Frequently Asked Questions

What are the important topics in Natural Disasters for Gujarat Board Class 8 Social Science?
Key topics in Natural Disasters include Natural Disasters Classification and Overview, Natural Disasters – Complete Chapter Overview, Natural Disasters – Complete Overview. These are the concepts Gujarat Board Class 8 examiners draw on most — study them first, then practise related questions.
How to score full marks in Natural Disasters — Gujarat Board Class 8 Social Science?
Understand the core concepts first, then work through the 44 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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