How Extrusive and Intrusive Rock formed?
Answers
When the molten magma comes on the earths surface it rapidly cools down and becomes rocks formed in such a way are called extrusive igneous rocks.
The molten magma cools down deep inside the earth's crust. Solid rocks so formed are called intrusive igneous rocks.
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intrusive rocks are formed from magma whereas extrusive rocks are formed from lava.
• Intrusive rocks are formed deep inside the surface of the earth whereas extrusive rocks are formed at the surface of the earth when magma finds a way to eject or pour out of the surface.
• Cooling and solidification of intrusive rocks takes place very slowly whereas contact with air and water causes cooling of extrusive rocks to take place at a very rapid rate.
• Intrusive rocks are made up of enormous crystals whereas extrusive rocks have tiny crystals that can be seen only with a microscope.
• Granite is the best example of intrusive rocks whereas the basalt is a fine example of extrusive rocks.
extrusive rock, any rock derived from magma (molten silicate material) that was poured out or ejected at Earth’s surface. By contrast, intrusive rocks are formed from magma that was forced into older rocks at depth within Earth’s crust; the molten material then slowly solidifies below Earth’s surface, where it may later be exposed through erosion.
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