This resource presents three examples of lava domes, from Alaska, Japan, and Saudi Arabia, along with a 3D simulated view of Mt. St. Helens' lava dome. A diagram shows the progressive growth of Mt. St. Helens' lava dome from 1980 to 1983. A link leads to a thorough explanation of dome-collapse pyroclastic flows (nuee ardentes) and another leads to a numerical program of lava dome growth. Full description.

Lava flows and their effects on areas surrounding volcanoes are explained in this United States Geological Survey (USGS) publication. Examples are sited from the Kilauea and Mauna Loa volcanoes in Hawaii, and the Unzen volcano in Japan. The site also links to specific case studies of lava flow destruction. Full description.

This is the Teacher Page of an activity that teaches students about the stratigraphy of lava flows produced by multiple eruptions. This page has background information on lava flows (with an emphasis on the Moon), recipes for the play dough required for the activity, and questions for the teacher to ask. The procedures for this activity can be found on the Student Page. This activity is part of Exploring ... Full description.

This resource provides general information about volcanoes. It illustrates the growth of a volcano, using Paricutin and Mt. St. Helens as examples of an active volcano and a lava dome. The terms extinct and dormant are also discussed. This site provides an explanation of why and how volcanoes form, zones of subduction, mid-ocean ridges, and hot spots. Deadly dangers associated with eruptions are discussed ... Full description.

This site describes the variability of eruption types, from quiescent lava emissions to extremely violent and explosive events. Eruption variability is largely related to magma composition and the amount of water present. Types of eruptions discussed include fissure and Hawaiian eruptions, which are characterized by fire fountains and lava lakes, strombolian eruptions as exemplified by Paricutin in ... Full description.

This site describes volcanic landscapes, which contain diverse landforms such as edifices, calderas, and lava domes. The three main edifices are scoria cones, shield volcanoes, and stratovolcanoes. A chart shows the outline of each along with its composition and eruption type. The calderas described include Crater-Lake type calderas associated with the collapse of stratovolcanoes, basaltic calderas ... Full description.

This United States Geological Survey (USGS) on-line publication contains details about the geologic and hydrologic hazards caused by volcanoes, specifically in the U.S. Information and details are provided about hazards such as eruption blasts, volcanic gases, lava and pyroclastic flows, volcano landslides and lahars. Full description.

This web page provides a first person account of a geologist's encounter with a lahar while surveying the Nima II river near the town of El Palmar in Guatemala, on August 14, 1989. Lahar is an Indonesian term that describes a hot or cold mixture of water and rock fragments flowing down the slopes of a volcano and (or) river valleys. While about 15 kilometers downstream from an active lava dome, Santiaguito ... Full description.

This page presents information about the four principle types of volcanoes found on Earth. Diagrams showing the internal structure of each type and photographs of well-known examples are provided. Full description.

This fact sheet discusses the eruptive history and hazards associated with Glacier Peak, the most remote of the five active volcanoes in Washington State. Topics include past eruptions, the potential for large, explosive eruptions with pyroclastic flows produced by collapse of lava domes, and prospects and preparations for future eruptions. Full description.