( Evaporation ( ( is ( ( the process ) ( ( by which ) ( water ( ( changes ( from ( a liquid ) ) ) ( to ( a ( ( gas or ) vapor ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Evaporation)) (VP (VBZ is) (NP (NP (DT the) (NN process)) (SBAR (WHPP (IN by) (WHNP (WDT which))) (S (NP (NN water)) (VP (VBZ changes) (PP (IN from) (NP (DT a) (NN liquid))) (PP (TO to) (NP (DT a) (NN gas) (CC or) (NN vapor)))))))) (. .)))
Evaporation is the process by which water changes from a liquid to a gas or vapor.
(ROOT (S (NP (NNP Evaporation)) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (NP (NN water)) (PP (IN on) (NP (DT the) (NN surface)))) (VP (VBZ changes) (PP (TO to) (NP (NN water) (NN vapor))))))) (. .)))