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Relief

ICSE · Class 12 · Geography

Quick revision notes for Relief — ICSE Class 12 Geography. Key concepts, formulas, and definitions for last-minute revision.

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Key Topics to Revise

1

Overview of India's Relief Divisions

  • India's total land area is distributed as: 10.7% mountainous (above 2,135 m), 18.6% hilly (305–2,135 m), 27.7% plateau (305–915 m), and 43% plains – as per Census Commission of India, 1951.
  • India has five major relief divisions: Himalayan Mountain Complex, Indus-Ganga-Brahmaputra Plain, Peninsular Plateau, Coastal Plains, and Islands.
  • The diversity of relief ranges from the world's youngest fold mountains (Himalayas) to one of the oldest plateaus (Peninsular Plateau).
2

The Himalayan Mountain Complex

  • The Himalayas stretch from the Indus River in the west to the Brahmaputra River in the east – a distance of about 2,400 km.
  • Average width ranges from 160 to 400 km.
  • The Himalayas consist of THREE parallel ranges: Great Himalayas (Himadri), Lesser/Middle Himalayas, and Outer Himalayas (Shiwalik Range).
3

The Indus-Ganga-Brahmaputra Plain

  • Extends for 2,400 km in east-west direction from Satluj to the Ganga delta, along the foot of the Himalayas.
  • Width varies from 150–300 km; narrowest in Assam (90–100 km); 160 km near Rajmahal Hills; 280 km near Prayagraj.
  • Formed by depositional work of Indus, Ganga, and Brahmaputra rivers and their tributaries.
4

The Peninsular Plateau

  • Oldest and most stable landmass of India. Forms an irregular triangle with base between Delhi Ridge and Rajmahal Hills, apex at Kanniyakumari.
  • General elevation: 600–900 metres. Dimensions: 1,600 km (N-S) × 1,400 km (E-W).
  • Surrounded by hills: Aravalis, Vindhyachal, Rajmahal Hills (north); Eastern Ghats (east); Western Ghats (west).

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Key Concepts

The Himalayas form a chainThis vast alluvial plain stretches 2The Peninsular Plateau forms an irregularIndia's coastline is flanked by twoIndia's island territories include the Lakshadweep

Frequently Asked Questions

What are the important topics in Relief for ICSE Class 12 Geography?
Relief covers several key topics that are frequently asked in ICSE Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Relief — ICSE Class 12 Geography?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision 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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