A weathered sign in the Minnesota River Valley proudly proclaims: “World’s Oldest Rock.” Erected in 1975, it marks a 3.8-billion-year-old gneiss — or so scientists thought.

Wildfires have already wrecked havoc across the US this year, and some areas are more at risk than others. California faced ...

The Organ Mountains-Desert Peaks National Monument was identified by the Trump administration as a potential target for ...

Interior Secretary Doug Burgum confirmed on Friday that the administration is reviewing the boundaries of several national monuments — meaning the administration could eventually move to shrink ...

Pollution levels in certain parts of the US are soaring to dangerous levels with vulnerable people being advised to avoid ...