Igneous rocks close igneous rockIgneous rocks are ... As the magma cools, mineral crystals will begin to grow. These crystals will grow and interlock to form a hard crystalline rock.
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What are thundereggs? The rare, chalcedony-filled rocksIgneous rocks form from the solidification of molten ... The rate of cooling affects the size of the crystals that form: slower cooling beneath the surface allows for larger crystals, while ...
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