5 fast facts about volcanoes Volcanic ash is made of fragments of rocks, minerals and volcanic glass. These pieces are the size of a grain of sand or smaller. The lava that erupts at Hawaii's ...

Much of this volcanic ash comes from the Great Basin, a geographic area within which the states of Utah and Nevada lie today.

Using volcanic ash for protection against radiation exposure lessens disposal issues after eruptions and turns the waste material into something useful.

Researchers predict the most likely outcome of the unrest at Mt. Spurr is “one or more explosive events” that could last as ...