In the extrusive rocks, the air and other gases get trapped in the lava at the time of cooling, while in intrusive rocks the pressure under the surface of the Earth is so much that it crushes any air holes that gets formed.
• The 95 percent of the rocks of the crust of the Earth is formed of igneous rocks.
• Based upon the formation, the igneous rocks are differentiated into two kinds, the extrusive and intrusive rocks.
• The formation of extrusive rocks takes place when the molten lava reaches the surface of the Earth and cools.
• In some of the extrusive rocks the formation of air pockets takes place, as air and some of the gases get trapped during the cooling of lava.
• On the other hand, the formation of intrusive rocks takes place when the molten rock cools before it reaches the surface of the Earth.
• During the formation of intrusive rocks, the pressure under the surface of the Earth is so much that any formation of air holes get crushed. Therefore, intrusive rocks exhibits no air pockets.
Thus, in the extrusive rocks, the air and other gases get trapped in the lava at the time of cooling, while in intrusive rocks the pressure under the surface of the Earth is so much that it crushes any air holes that gets formed.
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