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Isostasy

ICSE · Class 11 · Geography

Step-by-step guide to study Isostasy in ICSE Class 11 Geography. Topics to cover, practice strategy, and time allocation.

43 questions36 flashcards5 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 concepts.

2
Day 3

Practice Problems

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

3
Day 4

Revise & Test

Revise key formulas and concepts without looking at notes. Take a practice quiz to test your understanding. Mark weak areas for re-revision.

4
Day 7

Spaced Revision

Revisit Isostasy after a week. Use flashcards for quick recall. Solve previous year questions from 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 Isostasy: Complete Concept Overview, Isostasy: Concept Overview and Key Components, Isostasy – Complete Concept Overview. These are the concepts ICSE Class 11 examiners draw on most — study them first, then practise related questions.
How to score full marks in Isostasy — ICSE Class 11 Geography?
Understand the core concepts first, then work through the 43 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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