1. Essential Question: How are volcanoes classified?
Types of Volcanoes
Lesson Objective: Students will be able to describe the types of volcanoes.
Essential Question: How are volcanoes classified?

2. Do Now: Take out your homework and answer the following questions in your notebook
Volcanoes form along convergent boundaries as a result of
A. seafloor spreading.
B. hot spots in the mantle.
C. subduction and rising magma.
The area of earthquake and volcano activity around the Ocean is the Ring of Fire.
Pacific
Volcanoes that are not associated with plate boundaries are .
Hot spots
Volcanoes form along __ boundaries as one tectonic plate descends into the mantle and partially melts.
Convergent plate

3. HW Review: Key Concept Builder: How do volcanoes form?
sinks into the mantle
melts the mantle and forms magma
Volcano
magma rises through the opening
new oceanic crust forms
magma that erupts on the seafloor
a new volcano forms
it becomes inactive, or dormant
a chain of volcanoes forms

4. EQ: How are volcanoes classified?
Lesson Objective: Students will be able to describe the types of volcanoes.

5. Types of Volcanoes
Volcanoes are classified based on their shape and size.
Shield volcanoes: large volcanoes with gentle slopes of basaltic lavas, common along divergent plate boundaries and oceanic hotspots.
Volcan escudo: volcan grande con ligeras pendientes de lavas basalticas, comun a lo largo de los limites de placas divergentes y puntos calientes oceanicos.
Shield volcanoes erupt with a lava flow
Mauna Kea, Hawai’i

6. Types of volcanoes
Composite volcanoes: large, steep-sided volcanoes that result from explosive eruptions of andesitic and rhyolitic lava along convergent plate boundaries.
Volcan compuesto: volcan grande de lados empinados producido por erupciones explosivas de lavas andesiticas y rioliticas a lo largo de limites convergentes.
Eruptions are explosive.
Mount Fuji, Japan

7. Types of volcanoes
Cinder cones: small, steep-sided volcanoes that erupt gas-rich, basaltic lavas.
Cono de ceniza: volcan pequeno de lados empinados que expulsa lava rica en gas basaltico
Eruptions are moderately explosive
Pu’u O’o, Hawai’i

8. Types of Volcanoes
Some volcanoes are classified as supervolcanoes – volcanoes that have very large and explosive eruptions made of rhyolite.
These eruptions can form a caldera: a large volcanic depression formed when a volcano’s summit collapses or is blown away by explosive activity.
The Yellowstone Caldera in Wyoming ejected more than 2500x more material than Mount St. Helens.

10. Jigsaw Groups - Key Concept Builder: Types of Volcanoes
Students will be placed into “base groups” of 4 and numbered 1-4.
Based on your number, you will join a group with others of the same number to form an “expert group”.
In your expert group, you should be able to complete the worksheet table for your assigned type of volcano.
After 5 minutes, return to your base group and teach your groupmates.
Completion of this worksheet is your homework for tonight.