ICSE Class 9 Answered
Distinguish between Extrusive and Intrusive igneous rocks
Asked by vizaggraphics | 15 Jul, 2019, 10:29: PM
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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