( Eskers ( ( are ( ( ( glacial formations ) , ) ( created ( as ( sediments ( were ( deposited ( along ( ( the course ) ( of ( ( a stream ) ( tunneling ( beneath ( a ( melting glacier ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Eskers)) (VP (VBP are) (NP (NP (JJ glacial) (NNS formations)) (, ,) (VP (VBN created) (SBAR (IN as) (S (NP (NNS sediments)) (VP (VBD were) (VP (VBN deposited) (PP (IN along) (NP (NP (DT the) (NN course)) (PP (IN of) (NP (NP (DT a) (NN stream)) (VP (VBG tunneling) (PP (IN beneath) (NP (DT a) (JJ melting) (NN glacier))))))))))))))) (. .)))
Eskers are glacial formations, created as sediments were deposited along the course of a stream tunneling beneath a melting glacier.
(ROOT (S (NP (NNS Glaciers)) (VP (VB deposit) (NP (PRP$ their) (NN sediment)) (SBAR (WHADVP (WRB when)) (S (NP (PRP they)) (VP (VB melt))))) (. .)))