In the meantime, dozens of unstable meltwater lakes -- which can burst and cause massive flash floods -- have formed at the base of the glaciers.
(dozens of unstable meltwater lakes; can burst; ) (dozens of unstable meltwater lakes; cause; massive flash floods) (dozens of unstable meltwater lakes -- which can burst and cause massive flash floods; have formed; L:at the base of the glaciers; T:In the meantime)
dozens of unstable meltwater lakes dozens of unstable meltwater lakes dozens of unstable meltwater lakes -- which can burst and cause massive flash floods
can burst cause have formed
massive flash floods
L:at the base of the glaciers T:In the meantime