( metal ( ( ( ores and ) scrap ) . ) )
(ROOT (S (NP (NN metal)) (VP (VP (VBZ ores)) (CC and) (VP (VB scrap))) (. .)))
metal ores and scrap.
(ROOT (S (NP (NNS Metals)) (VP (VBP start) (PRT (RP out)) (PP (IN as) (NP (NN ore)))) (. .)))
Metals start out as ore.