( Conversely ( , ( ( upwelling zones ) ( ( are ( areas ( where ( ( the ( deep ( ocean ( water masses ) ) ) ) ( emerge ( to ( the surface ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Conversely)) (, ,) (NP (VBG upwelling) (NNS zones)) (VP (VBP are) (NP (NP (NNS areas)) (SBAR (WHADVP (WRB where)) (S (NP (DT the) (JJ deep) (NN ocean) (NN water) (NNS masses)) (VP (VBP emerge) (PP (TO to) (NP (DT the) (NN surface)))))))) (. .)))
Conversely, upwelling zones are areas where the deep ocean water masses emerge to the surface.
(ROOT (S (NP (NNP Upwelling)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (SBAR (WHADVP (WRB when)) (S (NP (JJ deep) (NN ocean) (NN water)) (VP (VBZ rises) (PP (TO to) (NP (DT the) (NN surface))))))))) (. .)))
Upwelling is the term for when deep ocean water rises to the surface.