Scientists worry that recent activity seen on a satellite at a volcano near a major U.S. city could spell disaster for thousands.

The research reveals the chilling truth about the impact of nuclear tests across the U.S., painting a picture of widespread ...

To the naked eye, the Asian longhorned tick isn’t much different than other ticks found in the United States: It too has eight legs, a round body, and mouthparts that latch onto its chosen host ...

By reading the rings of more than 1,500 trees across the western U.S., some of which were growing as early as 800, and stitching together the story they told, the team previously created a map of ...

With a competent guide, active volcano treks are both safe and worth the climb. Here are some of the biggest active volcanoes ...