SUMMARY: NASA's Terra satellite is keeping a watchful camera pointed towards a glacier in the mountains of Peru. A large crack has appeared in the sheet of ice, and it could crumble into Lake Palcacocha, sending a wall of water and rubble into a nearby town of 60,000 people. This has been a controversial announcement, however, with several US and Peruvian geologists feel that the danger is exaggerated.


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