( ( Introduction People ) ( ( have ( ( wondered ( for ( a ( long time ) ) ) ) ( ( ( ( why continents ) ( have ( such ( irregular shapes ) ) ) ) and ) ( why ( ( ( ( ( ( ( ( ( ocean basins ) , ) ( mountain ranges ) ) , ) ( earthquake belts ) ) , ) and ) ( many ( other features ) ) ) ( occur ( where ( they do ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Introduction) (NNS People)) (VP (VBP have) (VP (VBD wondered) (PP (IN for) (NP (DT a) (JJ long) (NN time))) (SBAR (SBAR (WHNP (WHADVP (WRB why)) (NNS continents)) (S (VP (VBP have) (NP (JJ such) (NN irregular) (NNS shapes))))) (CC and) (SBAR (WHADVP (WRB why)) (S (NP (NP (NN ocean) (NNS basins)) (, ,) (NP (NN mountain) (NNS ranges)) (, ,) (NP (NN earthquake) (NNS belts)) (, ,) (CC and) (NP (JJ many) (JJ other) (NNS features))) (VP (VBP occur) (SBAR (WHADVP (WRB where)) (S (NP (PRP they)) (VP (VBP do)))))))))) (. .)))
Introduction People have wondered for a long time why continents have such irregular shapes and why ocean basins, mountain ranges, earthquake belts, and many other features occur where they do.
(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.