( ( ( ( Coagulation ( is ( ( the process ) ( ( in which ) ( ( a chemical ) ( is ( added ( to ( ( a solution ) ( -LRB- ( ( water ( in ( this case ) ) ) -RRB- ) ) ) ) ) ) ) ) ) ) ) and ) ( ( the chemical ) ( causes ( ( the impurities ) ( to ( ( clump together ) ( for ( easy removal ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NNP Coagulation)) (VP (VBZ is) (NP (NP (DT the) (NN process)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (DT a) (NN chemical)) (VP (VBZ is) (VP (VBN added) (PP (TO to) (NP (NP (DT a) (NN solution)) (PRN (-LRB- -LRB-) (NP (NP (NN water)) (PP (IN in) (NP (DT this) (NN case)))) (-RRB- -RRB-))))))))))) (CC and) (S (NP (DT the) (NN chemical)) (VP (VBZ causes) (S (NP (DT the) (NNS impurities)) (VP (TO to) (VP (VB clump) (ADVP (RB together)) (PP (IN for) (NP (JJ easy) (NN removal)))))))) (. .)))
Coagulation is the process in which a chemical is added to a solution (water in this case) and the chemical causes the impurities to clump together for easy removal.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NN drinking) (NN water)) (VP (VBZ is) (VP (VBN treated))))) (, ,) (NP (NP (DT the) (NN term)) (PP (IN for) (SBAR (WHADVP (WRB when)) (S (NP (NNS chemicals)) (VP (VBP cause) (NP (NP (NNS solids)) (PP (IN in) (NP (DT the) (NN water)))) (PP (TO to) (NP (NN clump)))))))) (ADVP (RB together)) (VP (VBZ is) (ADJP (JJ coagulation))) (. .)))