DR JUERG ALEAN / SCIENCE PHOTO LIBRARY DR JUERG ALEAN / SCIENCE PHOTO LIBRARY
Physical weathering. Large boulders of igneous rock shaped by weathering. Weathering is the denudation of rock by a variety of physical processes. Here, traces of water have reacted with mineral veins in the rock to weaken it, and the thermal expansion and contraction of these hydrated minerals has loosened the rock further (exfoliation). This leaves the rock vulnerable to erosion by wind. Photographed in the Namib Desert, Africa.
Model release not required. Property release not required.