How are extrusive and intrusive rocks formed?
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Extursive are formed at the crust's surface as a result of the partial melting of rockswithin the mantle and crust and intursive are formed by the cooling of molten magma of the eath's surface.
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Extrusive or volcanic rocks:
These rocks are formed when magma breaks through the crust and reaches the surface of the earth (where it is called lava). It cools rapidly and solidifies to form rocks. The common rocks formed in this manner are basalt and obsidian.
Instrusive or plutonic rocks:
These rocks are formed when magma fails to break through the crust and cools slowly under the crust forming rocks. Because of slow cooling it solidifies into rocks with large grains of crystals. The common eg of rocks formed in this manner are granite and dolerite.
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