( ( ( Layered rock ) ( from ( ( the accumulation ) ( of ( sediment ( shifted ( through ( wind ( or ( water erosion ) ) ) ) ) ) ) ) ) ) ( ( form ( ( ( ( ( the ( weakest rock ) ) , ) or ) sedimentary ) rock ) ) . ) )
(ROOT (S (NP (NP (JJ Layered) (NN rock)) (PP (IN from) (NP (NP (DT the) (NN accumulation)) (PP (IN of) (NP (NP (NN sediment)) (VP (VBN shifted) (PP (IN through) (NP (NN wind) (CC or) (NN water) (NN erosion))))))))) (VP (VBP form) (NP (NP (DT the) (JJS weakest) (NN rock)) (, ,) (CC or) (ADVP (RB sedimentary)) (NP (NN rock)))) (. .)))
Layered rock from the accumulation of sediment shifted through wind or water erosion form the weakest rock, or sedimentary rock.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NNS sediments)) (VP (VB settle) (PRT (RP out)) (PP (IN of) (NP (NN water)))))) (, ,) (NP (PRP they)) (VP (VBP form) (NP (JJ horizontal) (NNS layers))) (. .)))
When sediments settle out of water, they form horizontal layers.