VOLCANOES CH. 3.1 Volcano 101 http://video.nationalgeographic.com/video/environment/environment-natural-disasters/volcanoes/volcanoes-101/ (3:08) Volcano Eruption http://dsc.discovery.com/video-topics/other/other-topics-volcano-videos.htm (1:40)

Intro: What is a Volcano? 1. A molten mixture of rock-forming substances, gases and water from the mantle is _magma__. 2. When magma reaches the surface it is called _lava__.

I. Volcanoes and Plate Boundaries A. What is the Ring of Fire?  a major volcanic belt that rims the Pacific Ocean  B. Volcanic belts form along the boundaries of Earth’s _plates_. C. Most volcanoes form along _diverging_ plate boundaries such as _mid__ - _ocean_ ridge.

Volcanoes D. Volcanoes also form along _diverging_ plate boundaries where _subduction_ takes place.   E. Diverging Boundaries 1. Ridges are long _underwater_ mountain ranges that sometimes have a _rift_ _valley_ at the center. Brain Pop: Volcanoes

F. Converging Boundaries 1. Volcanoes form where two __oceanic_ plates _collide_ or where oceanic meets _continental__ plates. 2. The volcanoes form a string of islands called an __island_ _arc_.

II. Hot Spot Volcanoes A. Some volcanoes form along __hot_ _spots__ in the Earth’s mantle. Volcano erupting http://www.youtube.com/watch?v=R0Zbj7S22zs (1:24)

Hot Spot Volcanoes B. What is a hot spot = an area where material from deep within the mantle rises and melts forming magma C. Where can you find a hot spot? 1. Hawaiian Islands 2. Yellowstone National Park Old Faithful, a geyser hot springs Volcano Song http://video.nationalgeographic.com/video/environment/environment-natural-disasters/volcanoes/volcanoes-101 (3:45) Magma Rising http://www.youtube.com/watch?v=tGm2ymM0Gaw (3:07)

Yellowstone National Park Hot Springs Volcanic caldera