
Lightning strikes over the Puyehue volcano, over 500 miles south of Santiago, Chile, Monday June 6, 2011. Authorities have evacuated about 3,500 people in the nearby area. The volcano was calm on Monday, two days after raining down ash and forcing thousands to flee, although the cloud of soot it had belched out still darkened skies as far away as Argentina. (AP Photo/Francisco Negroni, AgenciaUno)

A column of smoke and volcanic lightning are seen over the Puyehue volcano, over 500 miles south of Santiago, Chile, Sunday June 5, 2011. (AP Photo/Francisco Negroni, AgenciaUno)

A military helicopter is backdropped by the cloud of ash billowing from Puyehue volcano in southern Chile, 870 km south of Santiago, as it flies near Rininahue village on June 5, 2011. AFP PHOTO/CLAUDIO SANTANA

A cloud of ash billowing from Puyehue volcano is seen in southern Chile, 870 km south of Santiago, on June 5, 2011. Puyehue volcano erupted for the first time in half a century on June 4 prompting evacuations for 3,500 people as it sent a cloud of ash that reached Argentina. The National Service of Geology and Mining said the explosion that sparked the eruption also produced a column of gas 10 kilometers (six miles) high, hours after warning of strong seismic activity in the area. AFP PHOTO/Alvaro Vidal

Picture taken from Rininahue village showing the cloud of ash billowing from Puyehue volcano in southern Chile, 870 km south of Santiago, on June 5, 2011. AFP PHOTO/CLAUDIO SANTANA

A column of smoke and volcanic lightning are seen over the Puyehue volcano, over 500 miles south of Santiago, Chile, Sunday June 5, 2011. (AP Photo/Francisco Negroni, AgenciaUno)

Picture taken from Rininahue village showing the cloud of ash billowing from Puyehue volcano in southern Chile, 870 km south of Santiago, on June 5, 2011. AFP PHOTO/CLAUDIO SANTANA
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