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Ash and gases billow through low clouds after an eruption of the Puyehue-Cordon Caulle volcano in Chile, seen from Cardenal Samore, Chile, near the border with Argentina, on Wednesday June 15, 2011. (AP Photo/Alvaro Vidal) #


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Pumice floats on a mountain lake (top right) east of the Puyehue volcano, seen in this natural-color satellite image, taken on June 14, 2011. Parts of the lake not covered with pumice are colored aqua by the fine ash suspended in the water. Along the southern edge of the image is the ash plume, evidence of the continuing eruption which started on June 4, 2011. This image was acquired by the Advanced Land Imager (ALI) aboard the Earth Observing-1 (EO-1) satellite. (NASA Earth Observatory image by Jesse Allen and Robert Simmon, using EO-1 ALI data) #


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A man wearing a protective mask walks on a street blanketed in volcanic ash from Chile's Puyehue-Cordon Caulle volcano in Villa La Angostura in southern Argentina, on Tuesday June 14, 2011. (AP Photo/Federico Grosso) #


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A boat covered by volcanic ash sits on the bank of Nahuel Huapi Lake in Villa La Angostura in southern Argentina, on Thursday June 16, 2011. (AP Photo/Federico Grosso) #


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A sunset view of the ash cloud from Chile's Puyehue-Cordon Caulle volcano chain at the mountain resort San Martin de Los Andes in Argentina, on June 12, 2011. (Reuters/Patricio Rodriguez) #


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Police officers watch the warm water of the overflowing Nilahue River after the eruption of the Puyehue-Cordon Caulle volcano in Los Venados, Chile, on Thursday, June 9, 2011. (AP Photo/Roberto Candia) #


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Argentina's border police and rescue workers remove ash covered trees from a stream that leads to a lake to avoid blockage of the water passage in Villa La Angostura in southern Argentina, on Wednesday June 15, 2011. (AP Photo/Federico Grosso) #


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A detailed picture shows volcanic ash and pumice stones from the Puyehue-Cordon Caulle volcano floating in a patch of water in the Gol-Gol River, near the Chile-Argentina border road Cardenal Samore, over 500 miles south of Santiago, Chile, on Tuesday June 7, 2011. (AP Photo/Alvaro Vidal) #


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Dead fish float among pumice stones in the Nilahue River after the eruption of the Puyehue-Cordon Caulle volcano in Rininahue, southern Chile, on Wednesday, June 8, 2011. (AP Photo/Carlos Succo) #


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The billowing ash plume of Chile's Puyehue-Cordon Caulle volcano rises through the clouds after an eruption, seen from Cardenal Samore, in southern Chile, on Wednesday June 8, 2011. (AP Photo/Roberto Candia) #


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The MODIS instrument on NASA's Terra satellite captured a visible image of the ash plume from the eruption of Chile's Puyehue-Cordon Caulle volcano chain spreading across South America on June 13 , 2011. The wind shifted from the day before and was now blowing from the west and southwest, pushing the plume east and northeast. (Reuters/NASA Goddard/MODIS Rapid Response, Jeff Schmaltz) #


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A concentrated plume of ash from Chile's Puyehue volcano appears a world away (horizontal strip across middle), suspended in the atmosphere between 20,000 and 35,000 feet (6 to 11 kilometers) above above Australia and New Zealand. The Moderate Resolution Imaging Spectroradiometer (MODIS) on the Aqua satellite acquired this image on June 13, 2011. (NASA/Jeff Schmaltz, MODIS Rapid Response Team at NASA GSFC) #


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A road is blanketed in volcanic ash from Chile's Puyehue-Cordon Caulle volcano in Villa La Angostura in southern Argentina, on Tuesday June 14, 2011. The sign reads in Spanish; "Attention, children playing." (AP Photo/Federico Grosso) #


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A man stands on the banks of the ash-covered lake Nahuel Huapi, near San Carlos de Bariloche, Rio Negro, Argentina, on June 8, 2011, four days after the eruption of Chile's Puyehue volcano. (Francisco Ramos Mejia/AFP/Getty Images) #


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A view of the Nahuel Huapi Lake and a part of its coast covered with ash and pumice released by a volcano in the Puyehue-Cordon Caulle volcano chain, in the Argentine resort city of San Carlos de Bariloche, on June 7, 2011. (Reuters/Chiwi Giambirtone) #


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Volcanic ash and pumice cover part of Puyehue Lake after the eruption of the Puyehue-Cordon Caulle volcano in Puyehue, Chile, on Friday June 10, 2011. (AP Photo/Roberto Candia) #


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Lightning strikes over the Puyehue-Cordon Caulle volcano in Chile, seen from the border crossing of Cardenal Samore, in southern Chile, on Sunday June 12, 2011. (AP Photo/Alvaro Vidal) #


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An ash plume billows through the clouds after an eruption of the Puyehue-Cordon Caulle volcano in Chile, seen from Cardenal Samore, Chile, on Wednesday June 15, 2011. (AP Photo/Alvaro Vidal) #


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A cow is covered by wet ash from Chile's Puyehue-Cordon Caulle volcano in Villa La Angostura in southern Argentina, Thursday June 16, 2011. (AP Photo/Federico Grosso) #


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A vehicle belonging to Argentina's border police (Gendarmeria Nacional) drives on a mountain road covered by ash from Chile's Puyehue-Cordon Caulle volcano chain, in Villa Llanquin hamlet, near San Carlos de Bariloche, on June 17, 2011. (Reuters/Gendarmeria) #


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A passenger leans on a windowsill at Buenos Aires' airport, June 14, 2011. The volcano in the Puyehue-Cordon Caulle chain in Chile has been erupting for 10 days, throwing air travel in South America into chaos, as it spewed ash high into the atmosphere causing officials in Argentina to suspend most national and international flights. (Reuters/Marcos Brindicci) #


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A view of the Gol Gol river with its surface covered by floating pumice and volcanic ash, near the Puyehue volcano, close to Osorno, 870 km south of Santiago on June 7, 2011. (Claudio Santana/AFP/Getty Images) #


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Volcanic ash on the surface of Nahuel Huapi lake in the outskirts of San Carlos de Bariloche, southern Argentina, on Friday June 10, 2011. (AP Photo/Photo Patagonia) #


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A cat walks across ash-covered ground near Chile's Puyehue-Cordon Caulle volcano chain at the mountain resort San Martin de Los Andes in Argentina, on June 13, 2011. (Reuters/Patricio Rodriguez) #


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The mountain resort Villa la Angostura is blanketed with ash from Chile's Puyehue-Cordon Caulle volcano chain in Argentina's Patagonia on June 15, 2011. (Reuters/Osvaldo Peralta) #


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Cows stand on the bank of Nahuel Huapi Lake, blanketed with ash from Chile's Puyehue-Cordon Caulle volcano, at Villa La Angostura in southern Argentina, on Thursday June 16, 2011. (AP Photo/Federico Grosso) #


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A firefighter removes ash from electric lines in the mountain resort Villa la Angostura, on June 15, 2011. (Reuters/Osvaldo Peralta) #


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Youths skateboard on a street blanketed in volcanic ash from Chile's Puyehue-Cordon Caulle volcano in San Carlos de Bariloche in southern Argentina, on Saturday June 11, 2011. (AP Photo/Photo Patagonia) #


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Pumice and ash from the Puyehue volcano cover the shore and lake water at Paso Cardenal Samore along the border between Argentina and Chile, in San Carlos de Bariloche, on June 12, 2011. (Reuters/Gendarmeria/Handout) #


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Two people stand look out from the usually rocky lake shore, at the ash covered Nahuel Huapi lake, in San Carlos de Bariloche, southern Argentina, on Tuesday June 7, 2011. (AP Photo/Alfredo Leiva) #


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A diver of the Prefectura Naval Argentina inspects the Rio Limay covered with pumice and ash from Chile's Puyehue-Cordon Caulle volcano chain at the mountain resort of San Carlos de Bariloche in Argentina's Patagonia, on June 16, 2011. (Reuters/Chiwi Giambirtone) #


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A person looks at volcanic ash from the Puyehue-Cordon Caulle volcano as seen from Entrelagos, in southern Chile, on Friday, June 10, 2011. (AP Photo/Roberto Candia) #


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A cloud of ash billows from the erupting Puyehue volcano near Osorno in southern Chile, 870 km south of Santiago, on June 12, 2011. (Alvaro Vidal/AFP/Getty Images) #