( Faults ( ( are ( classified ( by ( ( the way ) ( ( in which ) ( ( ( the rocks ) ( on ( ( either side ) ( of ( the fault ) ) ) ) ) ( ( move ( in relation ) ) ( to ( one another ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Faults)) (VP (VBP are) (ADJP (VBN classified) (PP (IN by) (NP (NP (DT the) (NN way)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (NP (DT the) (NNS rocks)) (PP (IN on) (NP (NP (DT either) (NN side)) (PP (IN of) (NP (DT the) (NN fault)))))) (VP (VBP move) (PP (IN in) (NP (NN relation))) (PP (TO to) (NP (CD one) (DT another)))))))))) (. .)))
Faults are classified by the way in which the rocks on either side of the fault move in relation to one another.
(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))))))) (. .)))