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Question : 73 of 100
Marks:
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Solution:
All rocks may be classified into three major groups:
- Igneous Rocks,
- Sedimentary Rocks,
- Metamorphic Rocks.
1. Igneous Rocks:
- Igneous rocks are formed by the cooling and solidification of molten rock (magma) from beneath the earth's crust.
- Example: Granite, Gabbro, Basalt, etc.
2. Sedimentary Rocks:
- Sedimentary rocks are formed by the process of weathering and cementation or precipitation on the Earth's surface.
- Example: Sandstones,Kankar, shales, limestones, Mudstones, laterite, etc
3. Metamorphic Rocks:
- Formed when rocks are subjected to high heat, high-pressure changes inside the Earth.
- Example: Gneissoid, slate, schist, marble, quartzite, etc.
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