As the magma cools underground, it solidifies and crystals are formed.
In what way will these crystals be different from the crystals formed when lava solidifies above ground? ( relate the size of crystals)
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Plutonic rocks are formed when magma cools and solidifies underground. ... This tells us if the rock is plutonic or volcanic. When magma cools underground, it cools very slowly and when lava cools above ground, it cools quickly. When magma and lava cool, mineral crystals start to form in the molten rock.
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Igneous rocks contain randomly arranged interlocking crystals. The size of the crystals depends on how quickly the molten magma solidified: magma that cools slowly will form an igneous rock with large crystals. lava that cools quickly will form an igneous rock with small crystals.
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