( ( Lead toxicity ) ( ( can ( ( be ( a problem ) ) ( if ( ( discarded batteries ) ( contaminate ( ( ( ( water sources ) or ) ( old ( lead pipelines ) ) ) ( become corroded ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Lead) (NN toxicity)) (VP (MD can) (VP (VB be) (NP (DT a) (NN problem)) (SBAR (IN if) (S (NP (VBN discarded) (NNS batteries)) (VP (VBP contaminate) (S (NP (NP (NN water) (NNS sources)) (CC or) (NP (JJ old) (JJ lead) (NNS pipelines))) (VP (VB become) (ADJP (JJ corroded))))))))) (. .)))
Lead toxicity can be a problem if discarded batteries contaminate water sources or old lead pipelines become corroded.
(ROOT (S (NP (JJ Lead) (NN sulfate)) (VP (VBZ is) (NP (NP (DT the) (JJ white) (JJ solid)) (SBAR (WHNP (WDT that)) (S (VP (VBZ forms) (PP (IN on) (NP (JJ corroded) (NN battery) (NNS terminals)))))))) (. .)))