( It ( ( is ( ( called conservative ) ( because ( ( plate material ) ( ( is neither ) ( ( created nor ) ( ( destroyed ( at ( ( ( ( these boundaries ) , ) ( but rather ) ) ( plates slide ) ) ) ) ( past ( each other ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (VP (VBN called) (ADJP (JJ conservative)) (SBAR (IN because) (S (NP (NN plate) (NN material)) (VP (VBZ is) (RB neither) (VP (VP (VBN created)) (CC nor) (VP (VBN destroyed) (PP (IN at) (NP (NP (DT these) (NNS boundaries)) (, ,) (CONJP (CC but) (RB rather)) (NP (JJ plates) (NN slide)))) (PP (IN past) (NP (DT each) (JJ other)))))))))) (. .)))
It is called conservative because plate material is neither created nor destroyed at these boundaries, but rather plates slide past 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)))))))) (. .)))