( ( At ( a ( divergent ( plate boundary ) ) ) ) ( , ( ( two plates ) ( ( are ( ( moving away ) ( from ( each other ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN At) (NP (DT a) (JJ divergent) (NN plate) (NN boundary))) (, ,) (NP (CD two) (NNS plates)) (VP (VBP are) (VP (VBG moving) (PRT (RP away)) (PP (IN from) (NP (DT each) (JJ other))))) (. .)))
At a divergent plate boundary, two plates are moving away from 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)))))))) (. .)))