( ( ( ( ( ( ( ( ( Folding ( of ( ( Ductile Rocks ) ( When ( rocks ( deform ( in ( a ( ductile manner ) ) ) ) ) ) ) ) ) , ) ( instead of ) ) ( fracturing ( to ( form faults ) ) ) ) ( , ( they ( may ( ( bend or ) fold ) ) ) ) ) , ) and ) ( ( the ( resulting structures ) ) ( are ( called folds ) ) ) ) . )
(ROOT (S (S (S (VP (VP (VBG Folding) (PP (IN of) (NP (NP (NNP Ductile) (NNP Rocks)) (SBAR (WHADVP (WRB When)) (S (NP (NNS rocks)) (VP (VBP deform) (PP (IN in) (NP (DT a) (JJ ductile) (NN manner))))))))) (, ,) (CONJP (RB instead) (IN of)) (VP (VBG fracturing) (S (VP (TO to) (VP (VB form) (NP (NNS faults)))))))) (, ,) (NP (PRP they)) (VP (MD may) (VP (VB bend) (CC or) (VB fold)))) (, ,) (CC and) (S (NP (DT the) (VBG resulting) (NNS structures)) (VP (VBP are) (VP (VBN called) (NP (NNS folds))))) (. .)))
Folding of Ductile Rocks When rocks deform in a ductile manner, instead of fracturing to form faults, they may bend or fold, and the resulting structures are called folds .
(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))))))) (. .)))