Chapter 4 of 33
Revision Notes
Rocks — Revision Notes
ICSE · Class 11 · Geography
Rocks revision notes for ICSE Class 11 Geography: 4 topics in quick points. Key terms: The lithosphere is the outer, About 2 and Quartz is made of silicon.
44 questions40 flashcards5 concepts
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Key Topics to Revise
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1. Mineral Basis of Rocks
- There are about 2,000 minerals, and only 12 are common rock-formers.
- About 87% of the minerals in the earth's crust are silicates.
- Rocks are aggregates of minerals; a rock may contain one mineral or many minerals.
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2. Definition and Classification of Rocks
- Rocks are materials that form the crust of the earth, whether hard like granite or soft like clay, gravel or sandstone.
- Rocks are aggregates of minerals.
- Minerals in rocks exist separately and not in chemical combination.
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3. Igneous Rocks
- The word igneous comes from the Latin word 'ignis', meaning fire.
- Igneous rocks are formed through the solidification of molten materials.
- Molten materials move to the surface through cracks and joints from a depth of 60-100 km.
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4. Igneous Rock Bodies
- Batholith is the largest intrusive igneous rock body.
- Batholiths may be 50 to 80 km across and hundreds of kilometres long.
- A stock is a smaller batholith and is often less than 100 sq km in area.
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Full NotesKey Concepts
The lithosphere is the outer crustAbout 2Quartz is made of siliconCalcite is the most important carbonateIgneous rocks form by the solidification
Frequently Asked Questions
What are the important topics in Rocks for ICSE Class 11 Geography?
Key topics in Rocks include Mineral Basis of Rocks, Definition and Classification of Rocks, Igneous Rocks, Igneous Rock Bodies. Study these first, then practise questions on each for Class 11 exams.
How should I revise Rocks for Class 11 exams?
Learn the core ideas first, then work through the 44 practice questions on Rocks. 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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