JEFF GREENBERG / SCIENCE PHOTO LIBRARY JEFF GREENBERG / SCIENCE PHOTO LIBRARY
Hole-in-the-Wall Glacier. Aerial view of the Hole- in-the-Wall Glacier cascading over a cliff. The helicopter next to the glacier is taking tourists on a flightseeing tour of the glacier. A glacier occurs when more snow falls than melts. Over time, layers of fallen snow become compacted, forming ice. The mass of the ice in a glacier flows under the pull of gravity. As a glacier moves, it removes material from one location (erosion) and carries it to another (deposition). Photographed in Juneau, Alaska, USA.
Model release not required. Property release not required.