( ( As ( in ( ( Earth 's ) oceans ) ) ) ( , ( ( this water ) ( ( is ( full ( of it ) ) ) . ) ) ) )
(ROOT (S (PP (IN As) (PP (IN in) (NP (NP (NNP Earth) (POS 's)) (NNS oceans)))) (, ,) (NP (DT this) (NN water)) (VP (VBZ is) (ADJP (JJ full) (PP (IN of) (NP (PRP it))))) (. .)))
As in Earth's oceans, this water is full of it.
(ROOT (S (NP (NP (JJS Most)) (PP (IN of) (NP (NP (NN earth) (POS 's)) (NN water)))) (VP (VBZ is) (VP (VBN located) (PP (IN in) (NP (NNS oceans)))))))