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View Resource Weathering and Erosion in Desert Environments

This article provides a brief introduction to the processes of weathering and erosion in desert environments. Topics include the differences in the way these processes proceed in wet and arid environments, the role of flash floods and debris flows in moving large amounts of material very quickly, the influence of bedrock type on sediment characteristics, and the decrease in particle size with...

View Resource Pack Mentality

This radio broadcast explains how packrat nests, usually made of nearby sticks and leaves, may last as long as 40,000 years. The materials in these nests may reveal the ecology of an area in the past. Studies of the nests have revealed changes in the ecosystems of the deserts of Arizona and New Mexico over time. The MP3 clip is 2 minutes long.

View Resource Defining Desertification

This feature article from the National Aeronautics and Space Administration's Earth Observatory discusses the use of satellite imagery to evaluate desertification which is occurring in the Sahel, a region of central African savannah that forms the boundary between the Sahara Desert to the north and the wetter, more fertile regions to the south. Topics include the use of Very High Resolution...

View Resource Re-thinking Policies to Cope With Desertification

The phenomenon and process of desertification is one that is currently threatening one-third of the world?s population from Algeria to China. In December 2006, the United Nations convened a large panel of expert researchers to create a set of new, and hopefully, more effective policies that will help international organizations, national governments, and other concerned parties deal with the v...

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