( Faults ( ( are ( planes ( of ( fracture ( in ( rocks ( along ( which ( ( ( the rocks ) ( on ( ( one side ) ( of ( the fracture ) ) ) ) ) ( have ( ( moved relative ) ( to ( the other ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Faults)) (VP (VBP are) (NP (NP (NNS planes)) (PP (IN of) (NP (NP (NN fracture)) (PP (IN in) (NP (NP (NNS rocks)) (PP (IN along) (SBAR (WHNP (WDT which)) (S (NP (NP (DT the) (NNS rocks)) (PP (IN on) (NP (NP (CD one) (NN side)) (PP (IN of) (NP (DT the) (NN fracture)))))) (VP (VBP have) (VP (VBN moved) (ADVP (JJ relative)) (PP (TO to) (NP (DT the) (JJ other)))))))))))))) (. .)))
Faults are planes of fracture in rocks along which the rocks on one side of the fracture have moved relative to 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))))))) (. .)))