( ( Conclusive proof ) ( ( was ( produced ( during ( ( ( ( ( ( the 1960 ) ( ( ( 's however ) , ) ( to ( ( substantiate ( the fact ) ) ( that ( ( the continents ) ( ( move continually ) ( over ( ( the ( earth 's ) ) surface ) ) ) ) ) ) ) ) ) , ) ( ( the sea-bed ) ( constantly ( ( expands and ) ( is ( consumed ( beneath ( some ( of ( the continents ) ) ) ) ) ) ) ) ) ) and ) ( ( the ( oceanic crust ) ) ( is ( ( only ( a fifth ) ) ( of ( ( the age ) ( of ( the continents ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Conclusive) (NN proof)) (VP (VBD was) (VP (VBN produced) (PP (IN during) (S (S (NP (DT the) (CD 1960)) (VP (VBZ 's) (ADVP (RB however)) (, ,) (S (VP (TO to) (VP (VB substantiate) (NP (DT the) (NN fact)) (SBAR (IN that) (S (NP (DT the) (NN continents)) (VP (VBP move) (ADVP (RB continually)) (PP (IN over) (NP (NP (DT the) (NN earth) (POS 's)) (NN surface))))))))))) (, ,) (S (NP (DT the) (NN sea-bed)) (ADVP (RB constantly)) (VP (VP (VBZ expands)) (CC and) (VP (VBZ is) (VP (VBN consumed) (PP (IN beneath) (NP (NP (DT some)) (PP (IN of) (NP (DT the) (NN continents))))))))) (CC and) (S (NP (DT the) (JJ oceanic) (NN crust)) (VP (VBZ is) (NP (NP (RB only) (DT a) (JJ fifth)) (PP (IN of) (NP (NP (DT the) (NN age)) (PP (IN of) (NP (DT the) (NN continents)))))))))))) (. .)))
Conclusive proof was produced during the 1960's however, to substantiate the fact that the continents move continually over the earth's surface, the sea-bed constantly expands and is consumed beneath some of the continents and the oceanic crust is only a fifth of the age of the continents.
(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))) (. .)))