Grand Canyon National Park has launched a satellite-based emergency alert system, which allows visitors to receive real-time ...

Hawaii's Kilauea volcano is erupting again in spectacular fashion, sending lava shooting 1,000 feet into the sky, according ...

About 2,000 feet deeper than the Grand Canyon, Hells Canyon was rapidly carved when a lake spilled over about 2.1 million ...

Researchers are tracking how much sediment has been excavated since the river cut its new path. They hope to share the information with other communities with aging, at-risk dams.