( ( Stripes ( of ( opposite magnetization ) ) ) ( ( ( occur ( in ( the ( ocean basins ) ) ) ) ( because ( periodically ( ( ( ( ( the ( earth 's ) ) ( magnetic ( North ( Pole ( flips south ) ) ) ) ) and ) ( ( Earth 's ) ( magnetic field ) ) ) ( switches direction ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Stripes)) (PP (IN of) (NP (JJ opposite) (NN magnetization)))) (VP (VBP occur) (PP (IN in) (NP (DT the) (NN ocean) (NNS basins))) (SBAR (IN because) (S (ADVP (RB periodically)) (NP (NP (NP (DT the) (NN earth) (POS 's)) (JJ magnetic) (NNP North) (NNP Pole) (NNP flips) (NN south)) (CC and) (NP (NP (NNP Earth) (POS 's)) (JJ magnetic) (NN field))) (VP (VBZ switches) (NP (NN direction)))))) (. .)))
Stripes of opposite magnetization occur in the ocean basins because periodically the earth's magnetic North Pole flips south and Earth's magnetic field switches direction.
(ROOT (S (NP (NP (DT The) (NN earth) (POS 's)) (JJ magnetic) (NNS poles)) (VP (VBP have) (VP (VBN switched) (NP (NNS places)) (ADVP (RB repeatedly)) (PP (IN in) (NP (DT the) (NN past))))) (. .)))