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Geological Evolution

ICSE · Class 12 · Geography

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

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Key Topics to Revise

1

Basic Definitions and Geological Eras

  • Geology is the science of the earth's crust.
  • Historical geology studies the patterns of development of the crust in time and space.
  • Geological time is divided into Eras (primary intervals) and Periods (secondary intervals).
2

The Three Major Geological Units of India

  • India is composed of three major geological units: (1) Peninsular Plateau, (2) Himalayan Mountains, and (3) Indo-Gangetic Plains.
  • The Peninsular Plateau is the OLDEST landform of the Indian subcontinent.
  • The Himalayan Mountains are YOUNG fold mountains, much younger than the Peninsular Plateau.
3

The Peninsular Plateau – Geological History

  • The Peninsular Plateau is also called the Southern Plateau and is the oldest landform of India.
  • It is the Indian Plate – one of the several plates of the earth's crust.
  • During the Pre-Cambrian era, a block of crystal rocks emerged from a large depression and never submerged again.
4

The Himalayan Mountains – Formation and Plate Tectonic Theory

  • The Himalayas are Young Fold Mountains, much younger than the Peninsular Plateau.
  • Till the Mesozoic era (about 70 million years ago), the entire Himalayan area remained under the Tethys Sea – a geosyncline.
  • Angaraland was to the NORTH and Gondwanaland was to the SOUTH of the Tethys Sea.

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Full Notes

Key Concepts

Geological history is divided into largeThe southern part of India containsThe Himalayas are much younger thanThe Plate Tectonics Theory has replacedBetween the Himalayas to the north

Frequently Asked Questions

What are the important topics in Geological Evolution for ICSE Class 12 Geography?
Geological Evolution 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 Geological Evolution — 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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