( ( ( evaporation -- ) ( process ( ( by which ) ( water ( is ( ( changed ( from ( a liquid ) ) ) ( into ( a vapor ) ) ) ) ) ) ) ) . )
(ROOT (NP (NP (NN evaporation)) (: --) (NP (NP (NN process)) (SBAR (WHPP (IN by) (WHNP (WDT which))) (S (NP (NN water)) (VP (VBZ is) (VP (VBN changed) (PP (IN from) (NP (DT a) (NN liquid))) (PP (IN into) (NP (DT a) (NN vapor)))))))) (. .)))
evaporation ---process by which water is changed from a liquid into a vapor.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (JJ liquid) (NN water) (NNS changes)) (VP (TO to) (VP (VB water) (NP (NN vapor)))))) (NP (PRP it)) (VP (VBZ is) (VP (VBN called) (NP (NN evaporation)))) (. .)))
When liquid water changes to water vapor it is called evaporation.