( ( At ( strike-slip boundaries ) ) ( , ( two ( ( ( plates slide ) ( past ( each other ) ) ) . ) ) ) )
(ROOT (S (PP (IN At) (NP (JJ strike-slip) (NNS boundaries))) (, ,) (NP (CD two)) (VP (VBZ plates) (NP (NN slide)) (PP (IN past) (NP (DT each) (JJ other)))) (. .)))
At strike-slip boundaries, two 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)))))))) (. .)))