- UCB Earth Sciences & Map Library
An excellent site with a geology dictionary, and maps of U.S. states (including state maps with raised relief, elevation, rivers, roads and cities) and over 100 countries.
Oceanography on the Net (Scripps Institution of Oceanography Library)
- Water Use in the United States
Usage data for water usage by homes, farms and industry.
Weather and Climate
- Climatic Extremes and Weather Events
An National Oceanic and Atmospheric Administration site that tracks hurricanes, tornadoes, disasters, extreme temperatures, global climate change, etc.