Thread: Geography Notes- Paper A
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Old Sunday, March 02, 2014
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 Rocks

• ROCK DEFINITION
• 3 TYPES OF ROCK
i. IGNEOUS ROCKS
ii. SEDIMENTARY ROCKS
iii. METAMORPHIC ROCKS


2-IGNEOUS ROCKS
Q.1. Igneous rocks (Notes)

Q.2. Describe chief characteristics of igneous and sedimentary rocks.

1. IGNEOUS ROCKS: (Definition)

2. CLASSIFICATION OF IGNEOUS ROCKS
• Classification on the basis of Minerals
• Acid Igneous Rocks
• Basic Igneous Rocks

• Classification on the basis of situation
i. Intrusive Rocks
ii. Extrusive Rocks

• Classification on the basis of Forms
i. Sill
ii. Dyke
iii. Laccolith
iv. Lapolith
v. Phacolith
vi. Batholith

3. PROPERTIES OF IGNEOUS ROCKS

4. ECONOMIC IMPORTANCE OF IGNEOUS ROCKS
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