( Drumlins ( ( ( ( are low ) , ) ( smoothly ( ( ( ( ( ( rounded , ) ( elongate ( ( ( ( hills ( of ( compact ( glacial sediment ) ) ) ) , ) or ) ( ( other kinds ) ( of drift ) ) ) ) ) , ) ( built ( under ( the ice ) ) ) ) and ) ( shaped ( by ( its flow ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Drumlins)) (VP (VBP are) (ADJP (JJ low)) (, ,) (S (ADVP (RB smoothly)) (VP (VP (VBN rounded) (, ,) (S (VP (VB elongate) (NP (NP (NP (NNS hills)) (PP (IN of) (NP (JJ compact) (JJ glacial) (NN sediment)))) (, ,) (CC or) (NP (NP (JJ other) (NNS kinds)) (PP (IN of) (NP (NN drift)))))))) (, ,) (VP (VBN built) (PP (IN under) (NP (DT the) (NN ice)))) (CC and) (VP (VBN shaped) (PP (IN by) (NP (PRP$ its) (NN flow))))))) (. .)))
Drumlins are low, smoothly rounded, elongate hills of compact glacial sediment, or other kinds of drift, built under the ice and shaped by its flow.
(ROOT (S (NP (DT A) (NN drumlin)) (VP (VBZ is) (NP (NP (DT the) (NN name)) (PP (IN of) (NP (NP (DT a) (ADJP (JJ long) (CC and) (JJ low)) (NN hill)) (PP (IN of) (NP (NP (NNS sediments)) (SBAR (WHNP (WDT which)) (S (VP (VBP have) (VP (VBN been) (VP (VBN deposited) (PP (IN by) (NP (DT a) (NN glacier)))))))))))))) (. .)))