Firefighters mop up portions of Caldor Fire near South Lake Tahoe

Firefighters mop up portions of the Caldor Fire near South Lake Tahoe on September 6. Mopping up consists of extinguishing or removing burning material by turning it over, stirring it up, exposing it to the air and watering it down until it is completely cold. Credit: Lake Tahoe USFS via Storyful

     

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