An unstable glacier in Peru has raised fears of flooding. A huge lump of the glacier, which feeds Palcacocha lake in the Andes, is threatening to crack and drop into the lake below.
Peruvian authorities are using satellite images from the us -based National Aeronautics and Space Administration (nasa) to monitor the situation. They fear that the glacial breakup could flood the city of Huaraz in the Rio Santa Valley located underneath.
Floods caused by glacial breaks are known locally as