Which factor is responsible for the difference between extrusive and intrusive rocks?
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The major visible difference betweenthe two are crystal size, intrusive rockshave a larger crystal/grain texture due to the slow cooling of magma below the earth surface which encourages the growth of larger crystals, while extrusive rocks, because of the rapid cooling at/above the earth's surface does the opposite.
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in extrusive rocks they are formed on the surface of the earth due to to flow of magma which is erupted from volcanoes.
intrusive rocks they are formed below the surface of the earth due to the flow of magma which is erupted from volcanoes.
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