( Glaciers ( melt . ) )
(ROOT (S (NP (NNS Glaciers)) (VP (VB melt)) (. .)))
Glaciers melt.
(ROOT (S (NP (NNS Glaciers)) (VP (VB deposit) (NP (PRP$ their) (NN sediment)) (SBAR (WHADVP (WRB when)) (S (NP (PRP they)) (VP (VB melt))))) (. .)))