( ( As ( continents ( ( drift apart ) ( from ( one another ) ) ) ) ) ( , ( ( ocean crust ) ( ( is ( created ( in ( their wake ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN As) (S (NP (NNP continents)) (VP (VB drift) (PRT (RP apart)) (PP (IN from) (NP (CD one) (DT another)))))) (, ,) (NP (NN ocean) (NN crust)) (VP (VBZ is) (VP (VBN created) (PP (IN in) (NP (PRP$ their) (NN wake))))) (. .)))
As continents drift apart from one another, ocean crust is created in their wake.
(ROOT (S (NP (NP (DT The) (NN creation) (CC and) (NN destruction)) (PP (IN of) (NP (JJ oceanic) (NN crust)))) (VP (VBZ is) (NP (DT the) (NN reason) (NN continents) (NN move))) (. .)))