Perito Moreno glacier in Argentina is awesome - one of only three in Patagonia that are growing. Every so often, water builds up in the lake behind the ice and puts enough pressure to break through. The last time it happened was 16 years ago. What's special now is that for the first time, the break is happening in summer. Check out the video on the BBC news website for more at http://news.bbc.co.uk/1/hi/world/americas/7494686.stm.
