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.

Paleontologists have unveiled a 30,000-year-old vulture fossil in Italy, preserved in volcanic ash, showcasing microscopic ...