( ( ( ( Evaporation , ) ( which ( ( of course ) ( is ( powered ( by ( the sun ) ) ) ) ) ) ) , ) ( ( ( turns ( ( the ( liquid water ) ) ( of ( ( the oceans ) ( -LRB- ( ( and ( ( to smaller ) ( degree ( fresh water ) ) ) ) -RRB- ) ) ) ) ) ) ( into ( ( ( a ( gaseous state ) ) , ) ( which ( we ( call ( water vapor ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Evaporation)) (, ,) (SBAR (WHNP (WDT which)) (S (PP (IN of) (NP (NN course))) (VP (VBZ is) (VP (VBN powered) (PP (IN by) (NP (DT the) (NN sun))))))) (, ,)) (VP (VBZ turns) (NP (NP (DT the) (JJ liquid) (NN water)) (PP (IN of) (NP (NP (DT the) (NNS oceans)) (PRN (-LRB- -LRB-) (NP (CC and) (PP (TO to) (NP (JJR smaller))) (NP (NP (NN degree)) (NP (JJ fresh) (NN water)))) (-RRB- -RRB-))))) (PP (IN into) (NP (NP (DT a) (JJ gaseous) (NN state)) (, ,) (SBAR (WHNP (WDT which)) (S (NP (PRP we)) (VP (VBP call) (NP (NN water) (NN vapor)))))))) (. .)))
Evaporation, which of course is powered by the sun, turns the liquid water of the oceans (and to smaller degree fresh water) into a gaseous state, which we call water 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.