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ICSE Class 9 Answered

Distinguish between Extrusive and Intrusive igneous rocks  
Asked by vizaggraphics | 15 Jul, 2019, 10:29: PM
answered-by-expert Expert Answer

Intrusive Igneous Rocks

Extrusive Igneous Rocks

Intrusive igneous rocks are formed when the magma cools and solidify below the surface of the Earth.

 

Extrusive igneous rocks are formed by cooling the molten magma on the surface of the Earth. The molten magma comes on to the Earth’s surface through cracks, fissures and volcanic eruption

Since these rocks cools down slowly, they have coarse texture with large crystals

Since these rocks solidify at a faster pace, they are smooth, crystalline and fine grained.

 

Example: Dolomite

Example: Basalt

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