STEVE ALLEN / SCIENCE PHOTO LIBRARY STEVE ALLEN / SCIENCE PHOTO LIBRARY
San Rafael Glacier. Unstable ice formations at the terminus of the San Rafael Glacier. This glacier is one of the largest in the Northern Patagonian Icefield in Chile. It is a tidewater glacier (one that empties directly into the sea), and is the closest tidewater glacier to the equator. At the terminus of this glacier, ice is pushed out over the sea, forming an unstable mass that will eventually collapse under its own weight to form iccebergs.
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