BABAK TAFRESHI / SCIENCE PHOTO LIBRARY BABAK TAFRESHI / SCIENCE PHOTO LIBRARY
Lenticular clouds over Andean volcanoes. Lens-shaped lenticular clouds in the sky immediately above the Sairecabur volcanic group, a chain of stratovolcanoes on the border between Bolivia and Chile. These volcanoes are part of the Andean Central Volcanic Zone. The highest peak is Cerro Sairecabur (centre, 5971 metres).
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