This United States Geological Survey (USGS) website covers general information about lahars and their effects on areas surrounding volcanoes. Information given includes a description of lahars, what triggers a lahar, and the economic and environmental damage they inflict. Links to USGS websites documenting specific lahar case studies are found throughout the page. Full description.

This resource about Mount Rainier, a stratovolcano in the Cascade Range, features links to all aspects of the volcano, including its geographic setting, and geologic and eruptive history. Students learn that Mount Rainier is the highest and third-most voluminous volcano in the Cascades and that it dominates the Seattle-Tacoma area, where more than 1.5 million know it fondly as The Mountain. Also, ... Full description.

This homework exercise, which builds on knowledge gained in previous homework exercises located at the same site, asks students in an undergraduate class at Tulane University to answer some basic questions about volcanoes, and to determine the volcanic hazards associated with Mt. Rainier, Washington; Montserrat, West Indies; and Long Valley Caldera, California by searching the World Wide Web. Full description.

This article discusses the idea of 'hot spot' volcanoes, those not associated with plate tectonic boundaries, but rather with relatively stationary sources of heat energy (thermal plumes) in the mantle. Topics include the development of the theory by Canadian geophysicist J. Tuzo Wilson; the mechanics of volcanism over a hot spot as seen in the Hawaiian Islands; ancient Hawaiian observations of the ... Full description.

Follow ocean explorations in near real-time, learn about ocean exploration technologies, observe remote marine flora and fauna in the multimedia gallery, review NOAA's 200-year history of ocean exploration, and discover additional NOAA resources in a virtual library. View current expeditions or take a look back at the archived ones. Most expeditions feature fact sheets, photographs, explorer logs, ... Full description.

These activities pertain to the value of the different types of images, including a false color mosaic, a Compressed Stokes image, a vegetation map and key, and various ground photographs. Students are given specific directions on how to decide what features of a radar image indicate such structures as upland forest, clear-cut areas, and roads. In a second activity, students look at the radar images ... Full description.

Earthforces are defined as any push or pull that causes a change in motion, like eruptions, quakes, or floods. There are three categories of earthforces covered on this Franklin Institute Science Museum website: forces beneath the Earth's surface in the mantle and core, forces on the crust of the Earth involving plate tectonics, and water forces. Links are also provided for more information about ... Full description.

This animation is an adaptation of part of a narrated video shown in the HoloGlobe exhibit at the Smithsonain Museum of Natural History and the Earth Today exhibit at the Smithsonian Air and Space Museum. The red triangles represent volcanic activity over a 36-year span. This animation is meant to be combined with a map of the earth, such as the Blue Marble imagery. Full description.

Since the Hawaiian Islands were all created by volcanic activity, it is somewhat surprising that only the island of Hawaii now possesses any active volcanoes. Why did the volcanoes that built the other islands stop erupting and why are those on the big island still active? This video segment, adapted from a NOVA television broadcast, shows how plumes of hot material rise from the Earth's interior ... Full description.

This Web site brings together scientific content on Earth and space sciences with interdisciplinary content on the arts and humanities. Three levels of content are provided: students (K-12 through undergraduate), teachers, and browsing adults. The site includes documents, images, movies, animations, sounds, games, and data. Full description.