Question

•Question:-

Differentiate between extrusive and intrusive rocks.

Class 7th!!​

Answer 1

Extrusive or volcanic rocks are formed from molten material or magma which reach the Earth’s surface as lava, through volcanic vents or fissures, cools and solidifies. When the lava is exposed to the air, it cools rapidly and fine-grained, crystalline rocks are formed.

Extrusive or volcanic rocks are formed from molten material or magma which reach the Earth’s surface as lava, through volcanic vents or fissures, cools and solidifies. When the lava is exposed to the air, it cools rapidly and fine-grained, crystalline rocks are formed.Intrusive or plutonic rocks are formed when molten material or magma cools and solidifies below the Earth's surface. As the molten material within the Earth cools slowly, larger crystals or coarse-grained crystalline rocks are formed.

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