( Dynamic ( ( processes ( which ( form ( ( ( ( ( mountains , ) canyons ) , ) and ) ( ocean basins ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Dynamic)) (VP (VBZ processes) (SBAR (WHNP (WDT which)) (S (VP (VBP form) (NP (NP (NNS mountains)) (, ,) (NP (NNS canyons)) (, ,) (CC and) (NP (NN ocean) (NNS basins))))))) (. .)))
Dynamic processes which form mountains, canyons, and 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.