( ( Most ( of ( ( the water ) ( on earth ) ) ) ) ( ( is ( ( either ( ( saltwater or ) freshwater ) ) ( that ( is ( ( ( frozen ( in ( the ( polar ( ice caps ) ) ) ) ) and ) ( not ( usable ( by humans ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJS Most)) (PP (IN of) (NP (NP (DT the) (NN water)) (PP (IN on) (NP (NN earth)))))) (VP (VBZ is) (NP (NP (DT either) (NN saltwater) (CC or) (NN freshwater)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (UCP (VP (VBN frozen) (PP (IN in) (NP (DT the) (JJ polar) (NN ice) (NNS caps)))) (CC and) (ADJP (RB not) (JJ usable) (PP (IN by) (NP (NNS humans)))))))))) (. .)))
Most of the water on earth is either saltwater or freshwater that is frozen in the polar ice caps and not usable by humans.
(ROOT (S (NP (NP (JJS Most)) (PP (IN of) (NP (NP (DT the) (NN earth) (POS 's)) (NN freshwater)))) (VP (VBZ is) (PP (IN in) (NP (NP (DT the) (NN form)) (PP (IN of) (ADJP (JJ frozen)))))) (. .)))