( ( ( ( ( ( Land , ) air ) , ) and ) water ) ( ( ( are not ) ( ( separate elements ) ( of ( the environment ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Land)) (, ,) (NP (NN air)) (, ,) (CC and) (NP (NN water))) (VP (VBP are) (RB not) (NP (NP (JJ separate) (NNS elements)) (PP (IN of) (NP (DT the) (NN environment))))) (. .)))
Land, air, and water are not separate elements of the environment.
(ROOT (S (NP (NNP Air)) (VP (MD can) (VP (VB be) (VP (VBN separated) (PP (IN into) (NP (JJ several) (NNS elements)))))) (. .)))