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Study Plan

Isostasy — Study Plan

ICSE · Class 11 · Geography

A step-by-step study plan for Isostasy, ICSE Class 11 Geography: what to learn first, what to practise and when to revise.

43 questions36 flashcards3 formulas & key relations5 concepts

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Study Plan

1
Day 1–2

Learn the Theory

Read the textbook chapter carefully. Note down definitions, formulas and key ideas. Focus on: 1. Meaning and Basic Idea of Isostasy, 2. Early Observations and Evidence, 3. Airy's Concept of Isostasy.

2
Day 3

Practise

Solve the textbook exercises and extra practice questions. There are 43 questions available for this chapter.

3
Day 4

Revise & Test

Revise key points without looking at your notes. Take a practice quiz and mark weak areas for another pass.

4
Day 7

Spaced Revision

Come back to Isostasy after a week. Use flashcards for quick recall and try past exam questions on this chapter.

What to Focus On

  • Isostasy means balance in the earth's crust.
  • The term was first used by Dutton in 1889.
  • Higher features are lighter; lower features are denser.
  • Bouguer observed less-than-expected plumb-line deflection near Chimborazo.
  • Everest's survey in 1854 revealed a Himalayan gravitational anomaly.
  • Kalianpur and Kaliana are 603 km apart.
  • A partly hollow Himalayan mass is ruled out as a cause.
  • Light material extending to great depth is an accepted explanation.
  • Low-density lakes may also reduce the total attraction.

Common Mistakes to Avoid

Isostasy was first invented by Dutton in 1889, so he created the whole idea.

Airy’s model and Pratt’s model mean the same thing.

Airy’s concept says all places have the same density and only the surface shape changes.

Memory Tips

Meaning and origin of the term isostasy

Dutton first used the term isostasy in 1889

Bouguer’s Andes observation near Chimborazo

Sir George Everest’s survey and the Himalayan anomaly

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Frequently Asked Questions

What are the important topics in Isostasy for ICSE Class 11 Geography?
Key topics in Isostasy include Meaning and Basic Idea of Isostasy, Early Observations and Evidence, Airy's Concept of Isostasy, Pratt's Concept of Isostasy. Study these first, then practise questions on each for Class 11 exams.
How should I revise Isostasy for Class 11 exams?
Learn the core ideas first, then work through the 43 practice questions on Isostasy. Revise 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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