Huge chunk of Argentina's Perito Moreno glacier collapses (Feb 2012)
Part of the Perito Moreno glacier in Argentina's Patagonia has broken off putting on a spectacular show.
The glacier, a massive tongue of ice in the Santa Cruz province that covers 97 square miles, advances yearly into a lake, known as Lago Argentino.
As Perito Moreno moves forward, it cuts off a river feeding the lake. Water builds up pressure and slowly undermines the ice, forming a tunnel until ice comes tumbling down.
Glacier collapse rocks tourist boat (Aug 2011)
The boat was taking tourists through the Tracy Arm Fjord, a deep fjord over 30 miles long in the Tracy Arm-Fords Terror Wilderness in Alaska.
When a large chunk of ice falls off the side of a nearby glacier there is panic aboard the tourist boat and one woman reportedly broke her leg.
Apart from the dangers of falling ice, collapsing icebergs may also cause tidal waves that can tip small boats over.
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