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Igneous rocks are of 2 types-i)extrusive igneous rocks.ii)intrusive igneous rocks.
Igneous rocks are known as the primary or the basic rocks as they are known to be the
first formed rocks on earth.

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Characteristics of igneous rocks :-
1. Normally contains no fossils.
2. Usually has no layering
3. Rarely reacts with acids.
4. Usually made of two or more minerals.
5. May be light or dark coloured.
6. Usually made of mineral crystals of different sizes.
7. Sometimes has openings or glass fibers.
8. May be fine-grained or glassy (extrusive).
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