"What makes the event even more extraordinary is that it did not involve a single volcano, but multiple active sources." ...

Parts of the Grand Canyon's North Rim closed due to safety concerns related to the Dragon Bravo Fire last year. They could ...

The bulge first appeared in 1996 and has now returned, but Yellowstone Volcano Observatory says there's no cause for alarm.

Arizona is home to more than three dozen national parks, sites and monuments. These 10 easy to moderate hikes show off the ...

Do you think you can name all the famous people from Arizona? From Emma Stone to César Chávez, here's a list of 25 Arizonans ...

You've Probably Never Seen These Rare Vintage Photos of Lucille Ball Enormous freshwater reservoir discovered off the East ...

SpaceX is scheduled to launch a Falcon 9 rocket from California on Thursday, Jan. 29. Will it be visible in Arizona?

City officials said a total of 489 families, or 1,787 residents, have been evacuated from villages located within the volcano ...

Plan your adventure to Arizona’s most beautiful natural wonders, where unforgettable landscapes feel almost unreal.

GLOBE — Four people died after heavy rain caused flooding in Arizona, including three in this rural 19th-century mining town where floodwaters on Friday forced people to seek safety on rooftops and ...

Scientists on the AKMA3 ocean expedition discovered an exceptional underwater feature consisting of a mud volcano in the ...

Studying tree rings helped scientists pinpoint when Mount Rainier last sent a lahar down its steep slopes, which could help ...