Aquifer basics outlining the makeup of the basin and range aquifers. Description and maps of unconsolidated sand and gravel aquifers. This site consists of information for the Southwestern portion of the United States,...

When it comes to change, the Smithsonian National Museum of Natural History has got it covered. The online exhibitions of their "Forces of Change" series covers the current changes the world is facing, from sky to soil,...

In soil mechanics, it is virtually always useful to quantify the size of the grains in a type of soil. Since a given soil will often be made up of grains of many different sizes, sizes are measured in terms of grain size...

Lecture notes focusing on measuring grain size distributions (GSDs) of soils and the two methods used to do this. Provides procedures for Sieve Testing and Hydrometer Testing to find the GSD for particular grain sizes.

The Natural Resources Conservation Service provides an array of materials to assist people with their understanding of soils. Through an online presentation, users can learn ten key points about soil characteristics and...