KAJ R. SVENSSON / SCIENCE PHOTO LIBRARY KAJ R. SVENSSON / SCIENCE PHOTO LIBRARY
Eroded glacial landscape. These multi-coloured pyroclastic (formed from volcanic eruptions) beds and sandstone and mudstone layers were eroded by glacial movements 12,000 years ago. At this time, large ice-dammed lakes above the valley periodically released giant floods (called jokulhaups, Icelandic for glacial burst) and scoured the valley walls, exposing the colourful rock layers. The colours are due to mineral deposits in the layers, such as olivine (green) and pyroxene (red). Photographed at the Deadman River Valley, British Columbia, Canada.
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