( however ( , ( ( some ( mountain peaks ) ) ( ( extend ( to ( 3000 feet ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB however)) (, ,) (NP (DT some) (NN mountain) (NNS peaks)) (VP (VBP extend) (PP (TO to) (NP (CD 3000) (NNS feet)))) (. .)))
however, some mountain peaks extend to 3000 feet.
(ROOT (S (NP (NNS Scientists)) (VP (VBP know) (SBAR (IN that) (S (NP (DT some) (NNS mountains)) (VP (VBD were) (ADVP (RB once)) (PP (IN at) (NP (NP (DT the) (NN bottom)) (PP (IN of) (NP (DT an) (NN ocean))))) (SBAR (IN because) (S (NP (JJ marine) (NNS fossils)) (VP (VBP have) (VP (VBN been) (VP (VBN found) (PP (IN on) (NP (NP (DT the) (NNS peaks)) (PP (IN of) (NP (DT some) (NNS mountains)))))))))))))) (. .)))