( ( Divergent ( plate boundaries ) ) ( ( exist ( when ( ( two plates ) ( are ( ( moving away ) ( from ( each other ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Divergent) (NN plate) (NNS boundaries)) (VP (VBP exist) (SBAR (WHADVP (WRB when)) (S (NP (CD two) (NNS plates)) (VP (VBP are) (VP (VBG moving) (PRT (RP away)) (PP (IN from) (NP (DT each) (JJ other)))))))) (. .)))
Divergent plate boundaries exist when 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)))))))) (. .)))