1.  Chapter 5: Volcanoes ES 5.2 Volcanic Eruptions

2. Inside a Volcano  Magma Chamber : Collection of magma under volcano  Pipe : Long tube connecting chamber to surface  Vent : Opening at top (or sides) where magma leaves volcano  Lava Flow : The spread of lava on the surface  Crater : Bowl shaped feature at the top of volcano that surrounds the vent

4. Volcanic Eruptions  When a volcano erupts, the force of the expanding gases pushes magma from the magma chamber to the pipe until it flows or explodes out of the vent.  Mt. St. Helen’s Volcanic Eruption  http://youtu.be/xP2dreOI8gI http://youtu.be/xP2dreOI8gI

5. Types of Eruptions  Explosive Eruption :  High Silica Content  Thick and Sticky  This magma builds up in the pipe  This build up traps gases  Then BOOM!!!  This eruption spreads ash, cinders, and bombs!

6. Types of Eruptions  Quiet Eruption:  Hot and/or Low Silica Magma  Thin and Runny/Flows Easily  Produce different types of Lava; creating different type of igneous rock  Hawaii was formed by Quiet Eruptions

7. Hazards of Quiet Eruptions  Quick moving lava ran burn and bury everything in its path  Video of slow moving Lava destroying Hawaii  http://youtu.be/HpNWL CmXyTE http://youtu.be/HpNWL CmXyTE http://youtu.be/HpNWL CmXyTE

8. Hazards of Explosive Eruptions  Pyroclastic Flows : A hot, quick moving cloud of ash, cinder, and bombs that moves down the side of a volcano  Video of Pyroclastic Flows: http://youtu.be/WxlRpu Ted6g http://youtu.be/WxlRpu Ted6g http://youtu.be/WxlRpu Ted6g

9. Stages of Volcanoes  Active : A volcano that is erupting or showing signs of eruption in the near future  Dormant : aka Sleeping… Expected to be active in the near future  Extinct : aka Dead… Unlikely to ever erupt again. (Ex: hot spot volcanoes)