Volcanoes created by  TeachPower.net This lesson is a preview of a full complete lesson and contains animation, sounds, vi...
Magma Chamber Side Vent Vent Crater Pipe
Hot Spots <ul><li>Hot spots are caused from pockets of magma that raise up through openings in the crust. </li></ul><ul><l...
Ring of Fire <ul><li>Ring of Fire are volcanoes that are located on the edges of the Pacific plate that happen to make a r...
Styles of Eruptions <ul><li>Eruptions could be either explosive and violent or soft and quiet. </li></ul><ul><li>Explosive...
Magma  Composition &  Water  Content <ul><li>Magma that is low in silica is very liquidy and makes quiet eruptions (EX: Ki...
Forms of Volcanoes <ul><li>Shield Volcano </li></ul><ul><ul><li>Quiet eruptions spread out  silica  poor lave in flat laye...
Forms of Volcanoes <ul><li>Composite Volcano </li></ul><ul><ul><li>Some volcanoes can be either explosive or quiet. When a...
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Volcano

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Volcano

  1. 1. Volcanoes created by TeachPower.net This lesson is a preview of a full complete lesson and contains animation, sounds, video, and pictures that SlideShare.net does not show. To preview this lesson as it was originally intended please go to http://teachpower.net , click on the Lesson PowerPoints tab at the top, and scroll down until you see the name of this lesson in the appropriate category.
  2. 2. Magma Chamber Side Vent Vent Crater Pipe
  3. 3. Hot Spots <ul><li>Hot spots are caused from pockets of magma that raise up through openings in the crust. </li></ul><ul><li>While the plate moves the magma oozes out, cools, and makes new layers on top of other layers. </li></ul><ul><li>When these layers raise up above the level of the ocean they make islands, for example like the Hawaiian islands. </li></ul>
  4. 4. Ring of Fire <ul><li>Ring of Fire are volcanoes that are located on the edges of the Pacific plate that happen to make a rough ring of volcanoes. </li></ul><ul><li>Ring of fire is where most of the active volcanoes are located. </li></ul>
  5. 5. Styles of Eruptions <ul><li>Eruptions could be either explosive and violent or soft and quiet. </li></ul><ul><li>Explosive volcanoes act like a soda can that has been shaken up. </li></ul><ul><ul><li>Trapped gases like water vapor and CO 2 are in the magma and build up pressure until the magma nears the surface and the gases escape all at once forcefully . </li></ul></ul>
  6. 6. Magma Composition & Water Content <ul><li>Magma that is low in silica is very liquidy and makes quiet eruptions (EX: Kilauea in Hawaii) </li></ul><ul><ul><li>This lava pours out from sides of volcanoes called vents. It also pours out from rift zones which are long deep cracks like in Iceland. </li></ul></ul><ul><li>Magma with lots of silica make very violent, explosive eruptions (EX: Mount St. Helens in Washington) </li></ul>
  7. 7. Forms of Volcanoes <ul><li>Shield Volcano </li></ul><ul><ul><li>Quiet eruptions spread out silica poor lave in flat layers. </li></ul></ul><ul><ul><li>Have gentle sloping sides. </li></ul></ul><ul><ul><li>Looks like a shield laying down. </li></ul></ul>
  8. 8. Forms of Volcanoes <ul><li>Composite Volcano </li></ul><ul><ul><li>Some volcanoes can be either explosive or quiet. When a volcano erupts explosively then erupt quietly the next time, it makes different layers of tephra and cinders which is why it is called a composite volcano. </li></ul></ul><ul><ul><li>Mount St. Helens is a composite volcano because the Juan de Fuca plate was forced below the North American plate which caused eruptions to be explosive then quiet at different times. </li></ul></ul>

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