( ( ( ( ( ( Pressure ( in ( the ocean ) ) ) ( ( increases linearly ) ( with depth ) ) ) , ) but ) ( temperature ( ( ( is ( more variable ) ) , ) ( generally ( ( ( ( ( falling rapidly ) ( in ( ( the ( main thermocline ) ) ( from ( the surface ) ) ) ) ) ( to ( ( around a ) ( ( thousand metres ) deep ) ) ) ) , ) ( then ( ( remaining ( almost ( unchanged ( from there ) ) ) ) ( to ( ( the ( ocean floor ) ) ( in ( the ( deep sea ) ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NP (NN Pressure)) (PP (IN in) (NP (DT the) (NN ocean)))) (VP (VBZ increases) (ADVP (RB linearly)) (PP (IN with) (NP (NN depth))))) (, ,) (CC but) (S (NP (NN temperature)) (VP (VBZ is) (ADJP (RBR more) (JJ variable)) (, ,) (S (ADVP (RB generally)) (VP (VBG falling) (ADVP (RB rapidly)) (PP (IN in) (NP (NP (DT the) (JJ main) (NN thermocline)) (PP (IN from) (NP (DT the) (NN surface))))) (PP (TO to) (NP (NP (QP (RB around) (DT a))) (ADVP (NP (CD thousand) (NNS metres)) (RB deep)))) (, ,) (S (ADVP (RB then)) (VP (VBG remaining) (ADJP (RB almost) (JJ unchanged) (PP (IN from) (NP (RB there)))) (PP (TO to) (NP (NP (DT the) (NN ocean) (NN floor)) (PP (IN in) (NP (DT the) (JJ deep) (NN sea))))))))))) (. .)))
Pressure in the ocean increases linearly with depth, but temperature is more variable, generally falling rapidly in the main thermocline from the surface to around a thousand metres deep, then remaining almost unchanged from there to the ocean floor in the deep sea.
(ROOT (S (NP (NP (DT The) (NN pressure)) (PP (IN of) (NP (NN ocean) (NN water)))) (VP (VBZ increases) (ADVP (RB rapidly)) (SBAR (IN as) (S (NP (DT the) (NN water)) (VP (VBZ gets) (ADVP (RBR deeper)))))) (. .)))