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Igneous rock key
You have
identified your specimen as an igneous rock.
Igneous rocks are formed by hot molten rock
(called magma) erupting at the earth's
surface, on the ocean floor or deep inside the
earth's crust. Use the key below to help you
identify your igneous rock.
Is the rock fine grained i.e. you can't see separate
crystals with your naked eye?
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