Iowa Geological Survey Bureau, USA
Website of the Geological Survey Bureau of the Iowa Department of Natural Resources, including a Geologic Sample Database (GEOSAM)with geologic information for 35,000 locations in Iowa.
Maps and Geography
Map machine of National Geographic
NASA's Global Change Master Directory
A comprehensive directory of information about Earth science data, including a broad coverage of the oceans, atmosphere, hydrosphere, solid earth, biosphere and human dimensions of global change.
Physical Geography sites on Internet
Index of articles about Daylight Saving Time, the hydrologic cycle, El Nino, rivers, seasons, ice ages, and more topics in Physical Geography
The Distinctiveness of Geography
Systematic development of a series of definitions of various aspects and subdisciplines of Geography.
USGS Global Change Research Program
The U.S. Geological Survey's Global Change Research Program is an international source for ground-based and remotely sensed earth science data and information used by global change researchers and contributing to assessments of the potential effects of gl