( ( ( ( ( Formation and ) circulation ) ( of ( deep ( and ( bottom water ) ) ) ) ) ( in ( the ( world ocean ) ) ) ) . )
(ROOT (NP (NP (NN Formation) (CC and) (NN circulation)) (PP (IN of) (NP (JJ deep) (CC and) (JJ bottom) (NN water))) (PP (IN in) (NP (DT the) (NN world) (NN ocean))) (. .)))
Formation and circulation of deep and bottom water in the world ocean.
(ROOT (S (NP (JJ Deep) (NNS currents)) (VP (VBP are) (VP (VBN caused) (PP (IN by) (NP (NP (NNS differences)) (PP (IN in) (NP (NN density))))) (PP (IN at) (NP (NP (DT the) (NN top) (CC and) (NN bottom)) (PP (IN of) (NP (DT the) (NN ocean))))))) (. .)))