( ( ( ( Develop ( a definition ) ) ( for ( ( evaporation , ) ( which ( is water ) ) ) ) ) ( that ( ( changes ( from ( ( a liquid ) ( to ( a gas ) ) ) ) ) ( called ( ( water vapor ) ( which ( ( can not ) ( be seen ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Develop) (NP (DT a) (NN definition)) (PP (IN for) (NP (NP (NN evaporation)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (NP (NN water))))))) (SBAR (IN that) (S (NP (NP (NNS changes)) (PP (IN from) (NP (NP (DT a) (NN liquid)) (PP (TO to) (NP (DT a) (NN gas)))))) (VP (VBD called) (NP (NP (NN water) (NN vapor)) (SBAR (WHNP (WDT which)) (S (VP (MD can) (RB not) (VP (VB be) (VP (VBN seen))))))))))) (. .)))
Develop a definition for evaporation, which is water that changes from a liquid to a gas called water vapor which cannot be seen.
(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.