Cengage Learning
Geology Link
A geology news site that is updated daily with news on the latest geological happenings, such as earthquakes. It also has virtual field trips and a glossary of geology terms.
NOAA
Noaa: Nws: Office of Hydrologic Development
Has general hydrology information, hydrology research updates, and data from the National Remote Sensing Center. A good site discussing current information from the world of hydrology.