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Transcript 
VOLCANOES
CH. 3.1
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.
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.
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
Yellowstone National Park
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