( ( ( ( ( Faults , ) or ) fractures ) , ) ( ( are ( surfaces ( along ( which ( ( ( the rocks ) ( on ( one side ) ) ) ( are ( ( displaced ( with respect ) ) ( to ( those ( on ( the other ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Faults)) (, ,) (CC or) (NP (NNS fractures)) (, ,)) (VP (VBP are) (ADJP (JJ surfaces) (PP (IN along) (SBAR (WHNP (WDT which)) (S (NP (NP (DT the) (NNS rocks)) (PP (IN on) (NP (CD one) (NN side)))) (VP (VBP are) (VP (VBN displaced) (PP (IN with) (NP (NN respect))) (PP (TO to) (NP (NP (DT those)) (PP (IN on) (NP (DT the) (JJ other)))))))))))) (. .)))
Faults, or fractures, are surfaces along which the rocks on one side are displaced with respect to those on the other.
(ROOT (S (NP (DT A) (NN fault)) (VP (VBZ is) (NP (NP (DT the) (NN fracture)) (VP (VBN caused) (SBAR (WHADVP (WRB when)) (S (NP (NP (NNS rocks)) (PP (IN on) (NP (DT both) (NNS sides)))) (VP (VBP move))))))) (. .)))