VOLCANOES

Aim, Learning Target & Agenda  Aim:  What are the charactistics of the earth that explain volcanoes?  Learning Target:  I can explain what characteristics of Earth’s structure cause volcanoes  Agenda  Do Now  Lesson & Demos  Practice

Do Now  How do the plate boundaries relate to volcanoes?

Volcanoes are located on plate boundaries  Which type of plate boundaries in particular? (check out your ref table... )  (look at the key)  FIND THE INDIAN AUSTRALIAN AND THE PACIFIC PLATE

Online demo  &title=Convection_Currents

What just happened?  Write a 2 sentence description of what happened  The red, which represented the hot water, rose and the blue, which represented the cold water stayed on the bottom

Why would water move like that?  Think, Pair, Share  (think and jot down notes)  (pair up with a neighbor and discuss)  Share out with the class

Convection current (Review)  A fluid current set in motion by differenecs in density within the fluid

IV. Volcanoes A. Volcanic Regions on Earth Ring of Fire = region of volcanoes that encircle the Pacific Ocean

B. Causes of Volcanic Activity 1. Plate Boundaries – island arc volcanoes (Aleutians), subduction (Cascades, Andes)

2. Hot Spots – Hawaiian IslandsHot Spots a.Kaui4 my b.Oahu 2.5 my c.Molokai1.5 my d.Maui1 my e.HawaiiO.8 my

Mount St. Helens, Washington

D. Volcanic Features Neck

Volcanoes Videos D:\ #17  topics-volcano-videos.htm