Question

9. Differentiate between extrusive and intrusive igneous rocks
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Answer 1

the major visible difference between the two are crystal size, intrusive rocks have 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.

Answer 2

Difference between the two are crystal size, intrusive rocks have a larger crystal/grain texture due to the slow cooling of magma below the earth surface which encourages the growth of larger crystals.

Extrusive rocks, because of the rapid cooling at/above the earth's surface does the opposite.