7 June 2011 Last updated at 08:30 GMT
Eruptions from a Chilean volcano have left roads and rivers covered in a thick layer of ash.
Wind carried ash across the Andes, dropping a grey blanket on the Argentine resort of of Bariloche.
A change of direction then sent ash back to the Chilean side, where bulldozers have been brought out to try to clear the debris.
View video :http://www.bbc.co.uk/news/world-13679072
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