Volcanic ash is often talked about on the news when a volcano erupts or threatens to blow itself up but what actually is it?
It might surprise you to know that the term ‘ash’ (when we’re talking about volcanoes) is actually used to describe the grain-size of material ejected by a volcano. ‘Ash’ refers to all volcanic material of <2mm.
Therefore ash can be made up of a range of different materials all less than 2mm, including: rock fragments, crystals and fresh volcanic glass (AKA pyroclasts)
Find out more: The wonders of volcanic ash – an introduction