( ( Ask ( a ( student ( to ( ( find ( a ( plate boundary ) ) ) ( where ( ( the ( two plates ) ) ( are ( pushing ( against ( each other ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Ask) (NP (DT a) (NN student) (S (VP (TO to) (VP (VB find) (NP (DT a) (NN plate) (NN boundary)) (SBAR (WHADVP (WRB where)) (S (NP (DT the) (CD two) (NNS plates)) (VP (VBP are) (VP (VBG pushing) (PP (IN against) (NP (DT each) (JJ other)))))))))))) (. .)))
Ask a student to find a plate boundary where the two plates are pushing against each other.
(ROOT (S (NP (DT A) (JJ convergent) (NN plate) (NN boundary)) (VP (VBZ is) (VP (VBN created) (SBAR (WHADVP (WRB when)) (S (NP (CD two) (NNS plates)) (VP (VBP come) (PP (IN toward) (NP (DT each) (JJ other)))))))) (. .)))