DAVID SCHARF / SCIENCE PHOTO LIBRARY DAVID SCHARF / SCIENCE PHOTO LIBRARY
Volcanic ash. Coloured scanning electron micrograph (SEM) of ash produced during a volcanic eruption. Ash like this is used in the construction industry as a lightweight aggregate component for high-strength light-weight concrete. Magnification: x315, when printed 10 centimetres wide.
Model release not required. Property release not required.