PETER FALKNER / SCIENCE PHOTO LIBRARY PETER FALKNER / SCIENCE PHOTO LIBRARY
Basalt rock formation. Twin Buttes basalt rock formation (upper frame). This fine-grained, dark igneous rock is commonly found in the remains of old lava flows. Lava is capable of flowing great distances, and often forms thick piles as one flow builds on another. Photographed in Arizona, USA.
Model release not required. Property release not required.