( Infiltration ( ( occurs ( as ( water ( ( flows ( ( ( through ( ( the ( larger pores ) ) ( of rock ) ) ) or ) ( between ( ( soil particles ) ( ( ( ( under ( ( the influence ) ( of gravity ) ) ) , ) or ) ( as ( ( a ( gradual wetting ) ) ( of ( small particles ) ) ) ) ) ) ) ) ) ( by ( capillary action ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Infiltration)) (VP (VBZ occurs) (SBAR (IN as) (S (NP (NN water)) (VP (VBZ flows) (PP (PP (IN through) (NP (NP (DT the) (JJR larger) (NN pores)) (PP (IN of) (NP (NN rock))))) (CC or) (PP (IN between) (NP (NP (NN soil) (NNS particles)) (PP (PP (IN under) (NP (NP (DT the) (NN influence)) (PP (IN of) (NP (NN gravity))))) (, ,) (CC or) (PP (IN as) (NP (NP (DT a) (JJ gradual) (NN wetting)) (PP (IN of) (NP (JJ small) (NNS particles))))))))) (PP (IN by) (NP (JJ capillary) (NN action))))))) (. .)))
Infiltration occurs as water flows through the larger pores of rock or between soil particles under the influence of gravity, or as a gradual wetting of small particles by capillary action.
(ROOT (S (NP (NNP Gravity)) (VP (VBZ makes) (SBAR (S (NP (NN soil) (CC and) (NN rock) (NNS particles)) (VP (VBP move) (ADVP (RB gradually)) (ADVP (RB down) (NP (DT the) (NN slope)) (PP (IN during) (NP (DT each) (NN thaw)))))))) (. .)))