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why would you expect the crystals in an intrusive rock to be larger than the crystals in an extrusive rock
Yes. Intrusive rock means an igneous rock formed inside (intrusive). The fact that the hot rock is inside means when it cools it will cool slow because it has an inulating blanket of other rocks around it. [ When things cool slow, any crytals that form will have a chance to grow big. When things cool fast, as happens in an extrusive igneous rock, the crystals that grow get only a short time to
grow (compared to the intrusive) before they reach the solid state. Because the time is shorter the size will naturally be smaller. ]
Expert answered|WeggyExpert|Points 10|
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Asked 11/25/2013 6:13:12 AM
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