( ( ( ( Describe and ) classify ) ( ( rocks and ) minerals ) ) . )
(ROOT (S (VP (VB Describe) (CC and) (VB classify) (NP (NNS rocks) (CC and) (NNS minerals))) (. .)))
Describe and classify rocks and minerals.
(ROOT (S (NP (DT A) (NN mineral)) (VP (VBZ is) (VP (VBN described) (PP (IN as) (NP (NP (DT a) (JJ natural) (NN substance)) (SBAR (WHNP (WDT that)) (S (VP (VBZ makes) (PRT (RP up)) (NP (NNS rocks))))))))) (. .)))