Rocks and Rock Cycle
ICSE · Class 9 · Geography
Complete topic list for Rocks and Rock Cycle in ICSE Class 9 Geography. Key concepts, sub-topics, and what to focus on for board exams.
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Introduction to Rocks and Minerals
- Lithosphere is the solid outer layer of Earth, also called 'Rocksphere'
- Rocks are aggregates of minerals forming definite units of Earth's crust
- Minerals are naturally occurring solid inorganic substances with definite chemical composition
Igneous Rocks - Formation and Classification
- Formed from cooling and solidification of magma or lava
- Also known as primary rocks as they form directly from molten material
- Two types of magma: Basalt (hot, fluid) and Silicate (cooler, viscous at 850°C)
Sedimentary Rocks - Types and Formation
- Formed from weathered material of pre-existing rocks through denudation process
- Deposited in layers (strata), hence called stratified rocks
- Five main types: Mechanically formed, Organically formed, Chemically formed, Aeolian, Glacial
Metamorphic Rocks - Formation and Characteristics
- Formed by alteration of existing rocks due to heat, pressure, or chemical changes
- Generally become harder, denser, and darker than parent rocks
- Can form from igneous, sedimentary, or even other metamorphic rocks
Key Concepts
Central concept: Rocks and Rock Cycle
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