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Nature 424, 737-738 (14 August 2003) | doi:10.1038/424737a
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Earth science: Glaciers at work
Jan A. Piotrowski1
Abstract
Glaciers have been powerful agents in redistributing sediment and reshaping parts of the Earth's surface. Little is known about how exactly they do it, but a new hypothesis looks set to improve matters.
Over the past two million years, glaciers have repeatedly expanded into lower latitudes, before retreating and then advancing again. Instead of the processes of erosion and deposition that have operated during most of Earth's history, and that gradually level-off landscapes, during this time large parts the world's surface have experienced comparatively fast-acting forces that can shift large volumes of rock and soil.
- Department of Earth Sciences, University of Aarhus, DK-8000 Aarhus C, Denmark.
Email: jan.piotrowski@geo.au.dk
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