( ( Gold ( , ( ( silver and ) platinum ) ) ) ( ( are ( called ( ( ( the ( noble metals ) ) , ) ( ( a name ) ( that ( ( in ( chemical terminology ) ) ( ( refers ( to ( their ( outstanding resistance ) ) ) ) ( to ( ( the ( ( corrosion and ) oxidation ) ) ( that ( cause ( ( ( base metals ) ( such ( as ( iron ( , ( ( copper and ) tin ) ) ) ) ) ) ( to ( ( weaken and ) disintegrate ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Gold) (, ,) (NN silver) (CC and) (NN platinum)) (VP (VBP are) (VP (VBN called) (NP (NP (DT the) (JJ noble) (NNS metals)) (, ,) (NP (NP (DT a) (NN name)) (SBAR (WHNP (WDT that)) (S (PP (IN in) (NP (NN chemical) (NN terminology))) (VP (VBZ refers) (PP (TO to) (NP (PRP$ their) (JJ outstanding) (NN resistance))) (PP (TO to) (NP (NP (DT the) (NN corrosion) (CC and) (NN oxidation)) (SBAR (WHNP (WDT that)) (S (VP (VBP cause) (S (NP (NP (NN base) (NNS metals)) (PP (JJ such) (IN as) (NP (NN iron) (, ,) (NN copper) (CC and) (NN tin)))) (VP (TO to) (VP (VB weaken) (CC and) (VB disintegrate)))))))))))))))) (. .)))
Gold, silver and platinum are called the noble metals, a name that in chemical terminology refers to their outstanding resistance to the corrosion and oxidation that cause base metals such as iron, copper and tin to weaken and disintegrate.
(ROOT (S (NP (NN Platinum) (CC and) (NN gold)) (VP (VBP are) (NP (NP (JJ useful) (NNS materials)) (PP (IN for) (S (VP (VBG constructing) (NP (NP (NNS circuits)) (PP (RB because) (IN of) (NP (PRP$ their) (NN ability) (S (VP (TO to) (VP (VB resist) (NP (NN oxidation))))))))))))) (. .)))