'Hanging' glacier broke off to trigger India flood
A devastating flash flood in India's northern state of Uttarakhand killed at least 32 people and trapped workers in underground tunnels. It also sparked informed speculation on what caused Sunday's deluge.
Did an avalanche cause a glacial lake to burst? Or could an avalanche or landslide have dammed a river for some time, causing it to overflow? Or did ice blocks break off a glacier due to a rise in temperature?
Rescue efforts are still continuing, with more than 170 people missing - 12 workers were pulled out from a tunnel after being trapped in the freezing dark.
Now a team of scientists investigating the incident believe a piece of a Himalayan glacier did fall into water and trigger the huge flood in Uttarakhand state.
A glacier is a slowly flowing river of ice, accumulating snow, rock, sediment and often liquid water.
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