( ( ( ( The oceans ) and ) water ) ( ( are ( ( the ( main component ) ) ( of ( ( the ( earth 's ) ) surface ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNS oceans)) (CC and) (NP (NN water))) (VP (VBP are) (NP (NP (DT the) (JJ main) (NN component)) (PP (IN of) (NP (NP (DT the) (NN earth) (POS 's)) (NN surface))))) (. .)))
The oceans and water are the main component of the earth's surface.
(ROOT (S (NP (NNP Water)) (VP (VBZ is) (NP (NP (DT the) (JJ main) (NN component)) (PP (IN of) (NP (NN milk))))) (. .)))