( ( mantle plumes ) ( ( are ( stationary ( relative ( to ( motion ( of ( ( plates & ) ordf ) ) ) ) ) ) ) ; ) )
(ROOT (S (NP (JJ mantle) (NNS plumes)) (VP (VBP are) (ADJP (RB stationary) (JJ relative) (PP (TO to) (NP (NP (NN motion)) (PP (IN of) (NP (NP (NNS plates)) (CC &) (NP (NN ordf)))))))) (: ;)))
mantle plumes are stationary relative to motion of plates &ordf;
(ROOT (S (NP (NNS Earthquakes)) (VP (VBP mark) (NP (NP (DT the) (NNS motions)) (PP (IN of) (NP (NP (VBG colliding) (NNS plates)) (CC and) (NP (NP (DT the) (NNS locations)) (SBAR (WHADVP (WRB where)) (S (NP (NNS plates)) (VP (VBP plunge) (PP (IN into) (NP (DT the) (NN mantle))))))))))) (. .)))