DR MORLEY READ / SCIENCE PHOTO LIBRARY DR MORLEY READ / SCIENCE PHOTO LIBRARY
Volcanic ash. Woman wearing a face mask to prevent inhalation of volcanic ash from the air. Ash can cause respiratory ailments such as bronchitis. Photographed in Quito, the capital of Ecuador, after the eruption of the Reventador volcano in November 2002. Reventador is about 90 kilometres east of Quito in the Ecuadorian Amazon.
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