( ( On ( ( the origins ) ( of ( ( deep ( and ( bottom waters ) ) ) ( of ( the ( Indian Ocean ) ) ) ) ) ) ) . )
(ROOT (FRAG (PP (IN On) (NP (NP (DT the) (NNS origins)) (PP (IN of) (NP (NP (JJ deep) (CC and) (JJ bottom) (NNS waters)) (PP (IN of) (NP (DT the) (NNP Indian) (NNP Ocean))))))) (. .)))
On the origins of deep and bottom waters of the Indian 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))))))) (. .)))