STEVE ALLEN / SCIENCE PHOTO LIBRARY STEVE ALLEN / SCIENCE PHOTO LIBRARY
Waterfall and basalt rock. Waterfall flowing over close-packed hexagonal columns of basalt rock. Basalt is a type of igneous rock, formed from lava cooling on the Earth's surface. Photographed at Svartifoss in Skaftafell National Park, Iceland.
Model release not required. Property release not required.