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  1. Extrusive Igneous rocks
  2. Intrusive Igneous rocks

Asked by Topperlearning User 13th May 2015, 7:20 AM
Answered by Expert
  1. Extrusive igneous rocks: These rocks are formed due to the solidification of magma which reaches the Earth’s surface through fissures or volcanic eruptions. Since hot magma cools down and solidifies at a faster pace, these rocks are fine grained with a smooth texture. Example: basalt and feldspar.
  2. Intrusive igneous rocks: These rocks are formed when the magma is not able to reach to the surface of the Earth and cools down below the Earth’s surface. Since, magma takes a lot of time to cool beneath the Earth’s surface, intrusive rocks have large crystals and a coarse texture. Examples: granite and diorite.
Answered by Expert 13th May 2015, 9:20 AM
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