This United States Geological Survey (USGS) publication discusses earthquake intensity versus earthquake magnitude. It covers the differences between the two scales: Richter (magnitude), and Mercalli (intensity), as well as provides some photos of major earthquake damage. Full description.

This site focuses on the subject of volcanoes, including how volcanoes form, the destruction they can cause, effects of volcanoes on the environment, where active volcanoes are found, volcanoes of other planets, and the different volcano types. Designed as an electronic tour, it guides the user through different web sites and outlines teaching objectives, concepts covered, and new vocabulary. There ... Full description.

The Historical Hurricane Tracks tool is an interactive mapping application that allows you to easily search and display Atlantic Basin and East-Central Pacific Basin tropical cyclone data. At this web site you can learn about historical tropical cyclones occurring in different areas located throughout the Atlantic, Caribbean, and Gulf of Mexico. The web site provides information about U.S. coastal ... Full description.

This collection provides a wide array of visual resources and supporting material about the December 26, 2004 Indian Ocean Tsunami. Visualizations include simple animations, satellite photographs, Quicktime animations and tsunami models. The collection also contains visualizations related to other historical tsunamis and additional resources (beyond visualizations) about tsunamis. Resources can be ... Full description.

This United States Geological Survey (USGS) publication discusses the San Andreas Fault in California; specifically what has caused the fault, where it is located, surface features that characterize it, and movement that has occurred. General earthquake information includes an explanation of what earthquakes are, and earthquake magnitude versus intensity. Earthquakes that have occurred along the fault ... Full description.

This on-line book, published by the United States Geological Survey (USGS), covers the 1980 eruption of Mount St. Helens in Washington state. There is a discussion of the events leading up to the eruption, as well as an explanation of the mountain's volcanic history. Immediate effects are covered, including the ash falls, pyroclastic flows, and debris. Post-eruption topics include subsequent activity ... Full description.

This on-line project is part of the Center for Improved Engineering and Science Education (CIESE) program. As they complete this series of lessons, students will use real-time data to solve a problem, study the correlation between earthquakes and tectonic plates, and determine whether or not there is a relationship between volcanoes and plate boundaries. Musical Plates has four Core Activities that ... Full description.

This National Snow and Ice Data Center website presents a variety of general information about snow. It includes a question and answer section, which explains why snow is white, and the difficulties of forecasting snow, for example. There is a snow fact sheet, a glossary for snow terminology and weather terms, and a photo gallery of snow storms, ice storms, blizzards, avalanches, and other snow phenomena ... Full description.

Scientists in Action provides news about natural scientists and what they do, including: how scientists must react to rockfalls and earthquakes; spy plane modification by NASA to gather data to help forecast brush fires and spot toxic waste; frog malformation and population decrease; the 'Geologists in the Parks' program, which involves new earth scientists in helping National Park staff understand ... Full description.

This site offers links to educational weather and science resources. There are games and activities on clouds and lightning, the water cycle, hazardous weather, and our changing global climate. A Fun Fact of the Month provides weather-related trivia. Full description.