This USGS report presents an overview of the interactions between ground water and surface water in a variety of terrains. It serves as a general educational document with the intention of helping agencies understand the basic science involved in the management and protection of aquifers and watersheds. The report describes the natural processes of ground water and surface water interactions and the ... Full description.

MathWorld is possibly the most extensive math reference site on the web, and is geared toward the very advanced student. The algebra index is no exception, offering reference material on mainly upper level topics. Information is also available on more basic skills such as the quadratic equation, general identities, and algebraic properties. This resource is part of the Teaching Quantitative Skills ... Full description.

Eric Weisstein and Wolfram Research have built up a staggering number of math reference pages, all of which have extensive notation, diagrams, and examples. The trigonometry section covers basic trigonometry, identities, and angles, and also has material on more advanced topics such as spherical trigonometry, directed angles, and surveying. As with all the MathWorld sites, the information is abstracted ... Full description.

Another extensive reference site from MathWorld, this index offers pages on advanced and basic skills alike, though the information is presented with the very advanced student in mind. Very good notes and diagrams accompany reference material for plane geometry, non-Euclidean geometry, and general geometry, among many others. This resource is part of the Teaching Quantitative Skills in the Geosciences ... Full description.

From Lie theory to matrices, this site covers most of the topics included in linear algebra. Thorough notation and diagrams enhance the review pages and clarify the theorem explanations. Topics include linear transformation, systems of equations, and a complete overview of terms and definitions. Eigenvalues and eigenvectors, as well as many relevant theorems, can be found under the matrices tab. As ... Full description.

This site hosts a wealth of reference information on probability and statistics, from basic history and definitions to advanced applications. Topics covered include basic probability, various types of analysis, regression, distributions, and more. As with all the MathWorld sites, these have excellent notes and diagrams, but are designed for the very advanced student. This resource is part of the Teaching ... Full description.

This site features a menu of lessons and reference material on calculus concepts. Featured are several definitions of the derivative, treatments of discontinuity, and discussion of logarithms, integration, and antiderivatives. The sections are presented with clear notation and examples. Full description.

Beginning with a general review, this site provides a good refresher on basic trig identities, functions and angles. Good diagrams for unit circle and triangle trigonometry. Full description.

A handy reference on basic geometry formulas, this site covers distance, area, perimeter, and volume. Simple, straightforward notation, no diagrams or lessons. This resource is part of the Teaching Quantitative Skills in the Geosciences collection. http://serc.carleton.edu/quantskills/ Full description.

Follow this lesson to review basic exponent manipulation. Worksheets, further lessons, and lists of resources are also available. This resource is part of the Teaching Quantitative Skills in the Geosciences collection. http://serc.carleton.edu/quantskills/ Full description.