( ( The ( water cycle ) ) ( ( describes ( how ( water ( goes ( from ( ( the air ) ( ( ( ( to ( the land ) ) and ) back ) ( to ( the air ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN water) (NN cycle)) (VP (VBZ describes) (SBAR (WHADVP (WRB how)) (S (NP (NN water)) (VP (VBZ goes) (PP (IN from) (NP (NP (DT the) (NN air)) (PP (PP (TO to) (NP (DT the) (NN land))) (CC and) (ADVP (RB back)) (PP (TO to) (NP (DT the) (NN air)))))))))) (. .)))
The water cycle describes how water goes from the air to the land and back to the air.
(ROOT (S (NP (DT The) (NN water) (NN cycle)) (VP (VBZ involves) (NP (NP (NN movement)) (PP (IN of) (NP (NP (NN water)) (PP (IN between) (NP (NN air) (CC and) (NN land))))))) (. .)))