( ( ( The radiation ) ( of ( moving water ) ) ) ( presumably ( ( arises ( from ( ( stream currents ) ( of ( ( differing speeds ) ( ( flowing next ) ( to ( one another ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (NP (DT The) (NN radiation)) (PP (IN of) (S (VP (VBG moving) (NP (NN water)))))) (ADVP (RB presumably)) (VP (VBZ arises) (PP (IN from) (NP (NP (NN stream) (NNS currents)) (PP (IN of) (NP (NP (VBG differing) (NNS speeds)) (VP (VBG flowing) (ADVP (JJ next)) (PP (TO to) (NP (CD one) (DT another))))))))) (. .)))
The radiation of moving water presumably arises from stream currents of differing speeds flowing next to one another.
(ROOT (S (NP (DT A) (NN current)) (VP (VBZ is) (NP (NP (DT a) (NN stream)) (PP (IN of) (S (VP (VBG moving) (NP (NP (NN water)) (SBAR (WHNP (WDT that)) (S (VP (VBZ flows) (PP (IN through) (NP (DT the) (NN ocean)))))))))))) (. .)))