Wildfire threatens Grand Canyon's North Rim
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Firefighters in Colorado are planning an evacuation zone along the Black Canyon of the Gunnison National Park's North Rim as part of their continuing efforts to bring the South Rim Fire under control.
Here's what we know about the two wildfires that have destroyed tens of thousands of acres of forest and burned at least 70 structures.
Abnormally dry, hot conditions near the Grand Canyon's North Rim allowed the Dragon Bravo Fire to grow rapidly.
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