An explanation of the differences between limestone and marble, including some excellent pictures.

Maps and images that show liquefaction, the process by which water-filled sediment loses strength and acts like a fluid.

The basics of earthquake science including factual information about how and why they happen. Also includes some hands-on activities and experiments for students.

These time lapse movies of Kilauea are hosted by the Hawaiian Volcano Observatory. This resource also includes a webcam which provides near real time footage of two active volcanoes.

General information about the San Francisco earthquake, as well as some information about how studying that earthquake helped scientists in learning more about when and where earthquakes will occur.

A detailed description of events that took place during the 1811 and 1812 earthquakes in New Madrid, and information concerning a similar event in the future.

This site contains information about we have learned about the San Andreas Fault since 1906.

Updated daily, this page describes any notable earthquakes that happened on this day in history. Each earthquake has a link to more information about what happened on that particular day.

View interactive panoramic views taken by Apollo missions 11, 12, 14, 16 and 17. You can zoom in on each panoramic to see more detail.

A listing of PDF files on indium and its mining and sources. Check out this great resource!

The USGS offers maps of the locations of mines and mineral processing plants. You can find the sources for everything from aluminum to zircon!

Provides lessons and activities for teaching about the different types of coordinate systems including the Cartesian coordinate system, the Geographic Coordinate System, the Universal Transverse Mercator grid, and the State Plane...

Part of an online publication offered by the U.S. Geological Survey, this articles sheds light on how studying fossils became an important part of understanding geologic time.

This site from the U.S. Geological Survey provides a definition of public water supply, classification of public water, a description of consumption, supply, and distribution of water, water quality, a small public water-supply system,...

This site from the U.S. Geological Survey provides great definitions of seven measurements that can be taken on water. Includes pH, dissolved oxygen, and turbidity. Click Home to access the site in Spanish.

Site from the U.S. Geological Survey provides a brief list of volcano terminology including descriptions as well as links to major menus.

A very informative site, which is provided for by the U.S. Geological Survey, on how to write hydrologicic reports.

This resource from the United State Geological Survey provides data about San Francisco Bay's water quality. Data is displayed in time series plots, vertical profiles, longitudinal sections, space and time contours, and x-y scatter plots.

This U.S. Geological Survey website explains the desalinization method used by some communities to change sea water into drinking water. Click Home to access the site in Spanish.

This U.S. Geological Survey website offers one explanation of why the ocean is salty. Click Home to access the site in Spanish.

This U.S. Geological Survey website explains a variety of uses for saline water. Pie graphs and bar graphs are used to illustrate the various uses. Click Home to access the site in Spanish.

USGS provides the definition of a fault, the basics of earthquakes, the theory of plate tectonics, location of plates and earthquakes, and embedded links to related material.

Understand the evidence for ancient earth and the geologic time scale. Learn on this site how the earth can help scientist date discoveries.

Succinct descriptions of the different kinds of volcanoes, with additional links for each.