Discover interesting facts about how big earthquakes can get, why earthquakes happen, and why they're so hard to predict.

Earth's inner core may have changed shape, according to researchers studying unknown transformations deep within the planet.

Mount Spurr, whose volcanic ash darkened Anchorage’s skies in 1953 and 1992, may be building toward another eruption.

For nearly a year Mount Spurr, an active volcano near Anchorage, has shown increased activity of unrest. The activity could ...