table of 20th century eruptions. The dates are in chronological order starting with the most recent. Each eruption has a link and a description.

Explore some useful information about Mt. Vesuvius of Italy.

Follow the links to learn about snow accumulation, mass, balance and flow of glaciers. Find the cause of glacial decline.

Descriptions, photographs and information on the caterpillar life cycle for the different species of eastern United states caterpillars. Includes details on collecting and photographing specimens.

Excellent information provided by the U.S. Geological Survey.

Essential guide to geology of the National Parks focuses on minerals and the different types of rocks. Includes a visual glossary.

Overview and maps of the Gulkana Glacier along the south flank of the eastern Alaska Range.

Find out about earthquake hazards and damage. Some of the topics are an introduction to hazards, hazard maps, soil types and damage, and recent damage caused by earthquakes.

A description of the earthquake in Prince William Sound, Alaska in 1964. Links to isoseismal map, earthquake damage photos, and seismogram of the earthquake.

The U.S. Geological Survey reports on the latest news affecting the earth today, as well as providing a wealth of data, reports, and information.

Extensive information on Mt. Rainier in Washington. Links to current information, background information, visit a volcano, items of interest, publications and reports, educational outreach, menus of interest and useful links.

All the information that you would ever want to know about Mt. Saint Helens. There is a massive number of links to current information, background information, items of interest, eruption history and the May 18, 1980 eruption.

An in-depth explanation of the Earth's water cycle, including a hyperlinked diagram that provides direct access to information about each phase in the cycle.

A discussion of geologic time, how scientists use the concept, and how they have determined its span.

Visit the U.S. Geological Survey's website for a wide variety of information on water. Content includes data on water quality, water use, acid rain, among others; publications; information on water resource programs; maps; information on...

A collection of resources--pictures, maps, data, glossary--about water and the water cycle.

See interactive, 360 degree panoramic photos of the San Andreas Fault. Aerial photos of the fault were taken using a technique called Kite Aerial Photography.

The Great Plains organization provides individuals, organizations, and governments with key information about the Great Plains environment through a resource pool of publications, reports, and government data.

A massive amount of information about groundwater. Topics covered include groundwater basics, humans and groundwater, groundwater quality, and its place in the water cycle. Includes true-and-false quiz and a Q&A section, as well as a...

A quick summary of the water cycle that includes a diagram of the cycle, with links to in-depth explanations of each component of the cycle. Click "water-cycle home" to access water-cycle resources in a variety of languages.

This unit teaches learners how soils develop and provides links between soils, climate, vegetation, and geology. It includes a field exercise where students can sample and characterize their local soil and relate different soil processes...

Publication explores specific gemstones and the U.S. states where they are produced.

Website offers a history of the National Program for Topographic Mapping (1884-2009).

Comprehensive information on earthquakes. Includes photos from famous earthquakes, ask-an-expert feature, earthquake science, history of major earthquakes, a pictorial ABC, adults' guides for dealing with children's emotions, animations...