( ( The tides ) ( continually ( ( ( ( ( mix ( the waters ) ) and ) ( , ( ( by ( their ( ( rise and ) fall ) ) ) , ) ) ) ( water ( the plants ) ) ) . ) ) )
(ROOT (S (NP (DT The) (NNS tides)) (ADVP (RB continually)) (VP (VP (VB mix) (NP (DT the) (NNS waters))) (CC and) (PRN (, ,) (PP (IN by) (NP (PRP$ their) (NN rise) (CC and) (NN fall))) (, ,)) (VP (VB water) (NP (DT the) (NNS plants)))) (. .)))
The tides continually mix the waters and, by their rise and fall, water the plants.
(ROOT (S (NP (NNS Tides)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (SBAR (WHADVP (WRB when)) (S (NP (NP (DT the) (NN water)) (PP (IN of) (NP (DT the) (NN ocean)))) (ADVP (RB slowly)) (VP (VP (VBZ rises)) (CC and) (VP (VBZ falls)))))))) (. .)))