A volcano near Alaska’s largest city is showing new signs of unrest, with experts saying the likelihood of an eruption at Mount Spurr in the next few weeks or months has increased.

The Alaska Volcano Observatory said signs indicated a Mount Spurr eruption was likely, though not certain, in the weeks or ...

Mount Edgecumbe, specifically, was formed over time from volcanic ash and other debris piling up on one another, this magma rose through the ground and formed the steep summit that we can see today.