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Volcanoes

ICSE · Class 9 · Geography

Quick revision notes for Volcanoes — ICSE Class 9 Geography. Key concepts, formulas, and definitions for last-minute revision.

53 questions38 flashcards5 concepts

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A labeled cross-section diagram showing the internal and external components of a volcano, including the magma chamber, conduit, vent, crater, and layers of lava and ash.
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Key Topics to Revise

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1. Meaning and Types of Volcanoes

  • Volcanicity is the intrusion of magma in the Earth's crust or the extrusion of molten material on the Earth's surface.
  • A volcano is usually cone-shaped or dome-shaped according to the material ejected.
  • The two main types of volcanic landforms are intrusive forms and extrusive forms.
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2. Intrusive Volcanic Forms

  • Batholith is a large, coarse-grained igneous landmass that forms the base of mountains after erosion of the upper lying landmass.
  • Laccoliths are large sills of acid lava that solidify slowly and give a dome shape.
  • Sills are formed when lava solidifies before coming out between horizontal layers of parent rocks.
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3. Extrusive Volcanic Forms

  • Ash and Cinder Cones are built when eruptions are explosive.
  • Growth of an ash or cinder cone begins around a crater and it is not very high.
  • Lava Dome is formed when viscous lava solidifies quickly and forms a steep-sided cone.
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4. Classification Based on Activity

  • Volcanoes may be classified on the basis of intensity of eruption into active, dormant and extinct.
  • Active volcanoes constantly eject lava, gases, ashes, cinder and pumice.
  • About 50 out of 1500 active volcanoes erupt every year.

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Full Notes

Key Concepts

Volcanicity is the process inA volcano is a ventIntrusive forms are created when lavaExtrusive forms are created when lavaA batholith is a large

Frequently Asked Questions

What are the important topics in Volcanoes for ICSE Class 9 Geography?
Key topics in Volcanoes include Overview of Volcanoes — Key Concepts, Volcanoes — Complete Chapter Overview, Volcanoes - Complete Chapter Concept Map. These are the concepts ICSE Class 9 examiners draw on most — study them first, then practise related questions.
How to score full marks in Volcanoes — ICSE Class 9 Geography?
Understand the core concepts first, then work through the 53 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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