DR JUERG ALEAN / SCIENCE PHOTO LIBRARY DR JUERG ALEAN / SCIENCE PHOTO LIBRARY
Earth Pyramids. These spires are an example of a landform known as hoodoos. They are composed of unconsolidated material (moraine) deposited by glaciers during the last Ice Age (about 20,000 years ago). Each pillar is capped by a piece of rock that protects it from erosion. The unprotected material is eroded by rains, gradually forming a spire. Hoodoos form over long periods of time in sites sheltered from winds and in areas that have experienced varying periods of aridity and humidity. Photographed near Bozen, Italy.
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