( ( ( ACID ( ( RAIN AND ) GEOLOGY ) ) ( -LRB- ( handout -RRB- ) ) ) ( ( Background ( The ( pH scale ) ) ) . ) )
(ROOT (S (NP (NP (NNP ACID) (NNP RAIN) (CC AND) (NNP GEOLOGY)) (PRN (-LRB- -LRB-) (NP (NN handout)) (-RRB- -RRB-))) (VP (VBD Background) (NP (DT The) (NN pH) (NN scale))) (. .)))
ACID RAIN AND GEOLOGY (handout) Background The pH scale .
(ROOT (S (NP (NNS Acids)) (VP (VBP are) (VP (VBN associated) (PP (IN with) (NP (NP (DT a) (JJ low) (NN number)) (PP (IN on) (NP (DT the) (NN ph) (NN scale))))))) (. .)))