( ( ( ( ( ( E ( + AS ) ) ( , ( ( where ( P ( is precipitation ) ) ) ( , ( E ( is ( ( evaporation and ) evapotranspiration ) ) ) ) ) ) ) ( , ( ( AS ( is ( water ( stored ( within ( the cycle ) ) ) ) ) ) , ) ) ) and ) ( R ( is runoff ) ) ) . )
(ROOT (S (S (NP (NNP E) (NNP +) (NNP AS)) (, ,) (SBAR (WHADVP (WRB where)) (S (NP (NNP P)) (VP (VBZ is) (ADJP (JJ precipitation))))) (, ,) (NP (NNP E)) (VP (VBZ is) (NP (NN evaporation) (CC and) (NN evapotranspiration)))) (PRN (, ,) (S (NP (NNP AS)) (VP (VBZ is) (NP (NP (NN water)) (VP (VBN stored) (PP (IN within) (NP (DT the) (NN cycle))))))) (, ,)) (CC and) (S (NP (NN R)) (VP (VBZ is) (NP (NN runoff)))) (. .)))
E + AS, where P is precipitation, E is evaporation and evapotranspiration, AS is water stored within the cycle, and R is runoff.
(ROOT (S (NP (NP (NN Precipitation) (CC and) (NN runoff)) (PP (IN in) (NP (DT the) (NN water) (NN cycle)))) (VP (VBP are) (ADVP (RB primarily)) (ADJP (JJ responsible) (PP (IN for) (NP (NP (DT the) (NN creation)) (PP (IN of) (NP (DT a) (NN lake))))))) (. .)))