( ( ( ( ( Carbon dioxide ) , ) ( an ( important ( greenhouse gas ) ) ) ) , ) ( ( ( dissolves ( in rainwater ) ) ( to ( form ( ( carbonic acid ) ( which ( weathers ( silicate ( rock ( to ( ( form ( carbonates &oacute;a ) ) ( particularly ( ( common form ) ( being limestone ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Carbon) (NN dioxide)) (, ,) (NP (DT an) (JJ important) (NN greenhouse) (NN gas)) (, ,)) (VP (VBZ dissolves) (PP (IN in) (NP (NN rainwater))) (S (VP (TO to) (VP (VB form) (NP (NP (JJ carbonic) (NN acid)) (SBAR (WHNP (WDT which)) (S (VP (VBZ weathers) (NP (JJ silicate) (NN rock) (S (VP (TO to) (VP (VB form) (NP (JJ carbonates) (NN &oacute;a)) (PP (RB particularly) (S (NP (JJ common) (NN form)) (VP (VBG being) (ADJP (JJ limestone))))))))))))))))) (. .)))
Carbon dioxide, an important greenhouse gas, dissolves in rainwater to form carbonic acid which weathers silicate rock to form carbonates &oacute;a particularly common form being limestone.
(ROOT (S (NP (NNP Carbon) (NN dioxide)) (ADVP (RB chemically)) (VP (VBP weather) (NP (NNS rocks)) (PP (IN by) (S (VP (VBG creating) (NP (NNS acids)))))) (. .)))