As the plates interact or shift apart, the molten rock or magma beneath it can break through to form a volcano.
(the plates; interact; ) (the plates; shift apart; ) (the molten rock or magma beneath it; can break through; to form a volcano) (the molten rock or magma beneath it; to form; a volcano)
the plates the plates the molten rock or magma beneath it the molten rock or magma beneath it
interact shift apart can break through to form
to form a volcano
a volcano