( ( ( Bottom ( density currents ) ) ( with ( particle settling ) ) ) . )
(ROOT (S (VP (VB Bottom) (NP (NN density) (NNS currents)) (PP (IN with) (NP (NN particle) (NN settling)))) (. .)))
Bottom density currents with particle settling .
(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))))))) (. .)))