( ( ( ( ( It ( returns ( to ( ( the earth ) ( in ( ( the form ) ( of precipitation ) ) ) ) ) ) ) , ) then ) ( it ( evaporates again ) ) ) . )
(ROOT (S (S (NP (PRP It)) (VP (VBZ returns) (PP (TO to) (NP (NP (DT the) (NN earth)) (PP (IN in) (NP (NP (DT the) (NN form)) (PP (IN of) (NP (NN precipitation))))))))) (, ,) (RB then) (S (NP (PRP it)) (VP (VBZ evaporates) (ADVP (RB again)))) (. .)))
It returns to the earth in the form of precipitation, then it evaporates again.
(ROOT (S (NP (NNP Precipitation)) (VP (VBP are) (NP (NP (DT a) (JJ natural) (NN process)) (SBAR (WHNP (WDT that)) (S (VP (VBZ allows) (NP (NN water)) (S (VP (TO to) (VP (VB return) (ADVP (RB again)) (PP (TO to) (NP (NP (DT the) (NN earth) (POS 's)) (NN surface))))))))))) (. .)))