what is intrusive and extrusive igneous rocks?
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What is intrusive and extrusive igneous rocks?
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क्या घुसपैठ और extrusive आग्नेय चट्टानों है
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The two main categories of igneous rocks are extrusive and intrusive. Extrusive rocks are formed on the surface of the Earth from lava, which is magma that has emerged from underground. Intrusive rocks are formed from magma that cools and solidifies within the crust of the planet.
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INTRUSIVE IGNEOUS ROCKS
The rocks that cool below the surface of the Earth are called intrusive igneous rocks. The rate of cooling is slow inside the Earth, they take thousands of years to form and develop large crystals. These rocks are hard and compact. Dolerite and granite are examples of such rocks.
EXTRUSIVE IGNEOUS ROCKS
When the magma reaches the surface of the earth and cools down, it solidifies and forms rocks that are called extrusive igneous rocks. Due to rapid cooling, such rocks are fine-grained. The lava that comes out from the volcanoes cools down quickly so crystals are not very large, they are small in size. Basalt and obsidian are good examples of such rocks.