( ( Water ( on ( ( the ( on surface ) ) ( of Earth ) ) ) ) ( ( ( is constantly ) ( changing ( between ( these ( three states ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Water)) (PP (IN on) (NP (NP (DT the) (ADJP (IN on)) (NN surface)) (PP (IN of) (NP (NNP Earth)))))) (VP (VBZ is) (ADVP (RB constantly)) (VP (VBG changing) (PP (IN between) (NP (DT these) (CD three) (NNS states))))) (. .)))
Water     on the on surface of Earth is constantly changing between these three states.
(ROOT (S (NP (NNP Water)) (VP (VBZ exists) (PP (IN on) (NP (NP (NN earth)) (PP (IN in) (NP (NP (CD three) (NN matter) (NNS states)) (VP (VBZ states))))))) (. .)))