What are Volcanic Hazards? part of Videos:Video Gallery
In this video we will describe the most common types of volcanic hazards associated with a volcanic eruption. We begin by considering the threat of an eruption from a Cascade Range volcano for citizens of Portland and Seattle. These are examples of composite volcanoes. Eruptions of these types of volcanoes produce tephra, lahars, pyroclastic flows and lava. Tephra represents the debris blasted into the air and can range in size from tiny glass shards to large blocks blasted out of the volcanic cone. When tephra combines with water it forms lahars that can transport all sizes of debris. Fast moving, toxic pyroclastic flows are among the most dangerous volcanic hazards. Lava plays a relatively modest role in eruptions of composite volcanoes but is a common product of shield volcanoes such as those in Hawaii.

Quiz for What are Volcanic Hazards? video part of Videos:Activities
David McConnell, North Carolina State University
Six question quiz (w/answer key) associated with What are Volcanic Hazards? video

Convergent Plate Boundaries part of Videos:Video Gallery
This video describes the physical features that can be observed at three different types of convergent plate boundaries and explains the geologic processes that produce these features. We characterize the distribution of earthquakes and volcanoes associated with convergent boundaries and relate them to subduction of the cold descending plate and the addition of water to the hot overriding plate. We describe the difference between a volcanic arc and an island arc, and discuss why the crust is much thicker where to slabs of continental lithosphere collide. Finally, we use hands and oven mitts to produce simple analogs of the three convergent boundary types. Really.

Volcano Visualizations part of Hazards:Visualization Collections
Compiled by John McDaris and Kendra Murray at SERC. This collection presents links to visualizations of volcanoes and volcanic processes. Visualizations include general depictions of igneous processes as well as ...

2010 Icelandic Volcano Eruption part of Hazards:Events
The eruption of the Eyjafjallajökull volcano in March and April 2010 posed significant challenges for the people of Iceland as well as millions of people across Europe whose airplanes were grounded due to the high concentrations of volcanic ash. One unresolved question centers around the whether this eruption will trigger an eruption by the larger Katla volcano which is located close by and often erupts after its smaller neighbor.

How to Classify Volcanoes part of Videos:Video Gallery
This video describes the features geologists use to classify common types of volcanoes. We compare and contrast the features of two types of large volcanoes - shield volcanoes and composite volcanoes. One of these types produces structures that can be larger than Mount Everest while the other represent the majority of dangerous active volcanoes on Earth.We also explain that two other types of smaller volcanic landforms are relatively common and often form in association with their larger brethren. Finally, you can take a simple volcano recognition quiz to try to classify five examples of US volcanoes.

Volcanic Bombs part of Videos:Video Gallery
Airplane footage of plume from Eyjafjallajökull, Iceland (2010) who have to run when the volcanic bombs start to fall around them.

Magma Viscosity, Gas Content & Milkshakes part of Videos:Video Gallery
This video describes the principal control on the violence of volcanic eruptions. We define the term viscosity and show examples of everyday materials with different viscosity. Next we are splattered with soda and milkshake to illustrate how gases can drive volcanic eruptions (the sacrifices we make for science). Finally, we explain how viscosity and gas content influence the style of eruptions from shield and composite volcanoes.

Using Dynamic Digital Maps to Teach Petrology part of Petrology:Teaching Examples
Christopher D. Condit
In this session we will examine how to utilize Dynamic Digital Maps (DDMs) in undergraduate petrology courses to bring inaccessible and exciting volcanic field areas to the students in the classroom and to engage ...

Quiz for How to Classify Volcanoes video part of Videos:Activities
David McConnell, North Carolina State University
This is a one-page pdf quiz made up of six multiple choice questions and three volcano images that students are asked to classify.