( ( As ( ( ( shown ( on ( video screens ) ) ) ( throughout ( ( ( the exhibit ) , ) convection ) ) ) ( over ( time ( forms mountains ) ) ) ) ) ( , ( moves ( ( ( ( continents and ) creates ) ( ocean basins ) ) . ) ) ) )
(ROOT (S (SBAR (IN As) (S (VP (VBN shown) (PP (IN on) (NP (JJ video) (NNS screens))) (PP (IN throughout) (NP (NP (DT the) (NN exhibit)) (, ,) (NP (NN convection)))) (PP (IN over) (NP (NN time) (NNS forms) (NNS mountains)))))) (, ,) (NP (NNS moves)) (VP (VBZ continents) (CC and) (VBZ creates) (NP (NN ocean) (NNS basins))) (. .)))
As shown on video screens throughout the exhibit, convection over time forms mountains, moves continents and creates ocean basins.
(ROOT (S (S (NP (DT This) (NN process)) (ADVP (RB usually)) (VP (VBZ takes) (NP (NP (DT the) (JJS longest) (NN amount)) (PP (IN of) (NP (NN time)))))) (: :) (S (NP (DT an) (NN ocean) (NN basin)) (VP (VBZ forms) (PP (IN between) (NP (CD two) (NNS continents))))) (. .)))
This process usually takes the longest amount of time: an ocean basin forms between two continents.