Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.
Liquid Hot Magma. Volcanoes Tungerahua Volcano, Ecuador  Picture by Alcinoe Calahorrano
Volcano Stats <ul><li>Definition of  Volcano </li></ul><ul><ul><li>Mountain that forms when molten rock (magma) is forced ...
<ul><li>Nonexplosive Eruptions </li></ul><ul><li>Explosive Eruptions </li></ul>Volcanic Eruptions  What is  Lava ? -magma ...
Volcano Model  Demonstration
1. What did you learn? Write/draw this in your science journal. Volcanoes  form around  vents  that release magma onto the...
<ul><li>High water content </li></ul><ul><ul><li>More likely to be !!! </li></ul></ul><ul><li>High    content </li></ul><u...
Explosive Volcano Model  Demonstration
<ul><li>a. What physical event causes explosive eruptions? </li></ul><ul><li>b. Would high water content increase the like...
What Erupts from a Volcano? Lava can be  thick or thin. Blocky lava Pahoehoe Aa Pillow lava
What Erupts from a Volcano? <ul><li>Pyroclastic material </li></ul><ul><li>Rock  fragments created by    eruptions </li></...
How do volcanoes affect the Earth? <ul><li>Flows and Fallouts </li></ul><ul><li>hot ash can flow  really quickly </li></ul...
Types of Volcanoes Shield volcano Cinder cone volcano Composite volcano
Craters, Calderas, and Lava Plateau <ul><li>Crater </li></ul><ul><li>From explosions of material out of the vent and the c...
What causes volcanoes? <ul><li>The Formation of Magma </li></ul><ul><li>Mantle rock melts when the temperature increases  ...
What causes volcanoes? <ul><li>Where Volcanoes Form </li></ul><ul><li>Tectonic Plate Boundaries!!! </li></ul>~75% world’s ...
What causes volcanoes?
What causes volcanoes? Hot Spots
<ul><li>Measuring Small Quakes </li></ul><ul><ul><li>Before eruption, increase in number & intensity </li></ul></ul><ul><l...
You should not be a Volcanologist if…. <ul><li>You don’t like hiking, backbacking, rockclimbing, etc. </li></ul><ul><li>Yo...
Eruption  Anticipation  Activity
<ul><li>Place 10mL of baking soda in center of a sheet of bathroom tissue.  Fold the corners over the baking soda and crea...
<ul><li>a. Was your time prediction close to the real time of eruption? </li></ul><ul><li>b. Are the eruption times simila...
Upcoming SlideShare
Loading in …5
×

Volcanoes

840 views

Published on

Volcanoes

  1. 1. Liquid Hot Magma. Volcanoes Tungerahua Volcano, Ecuador Picture by Alcinoe Calahorrano
  2. 2. Volcano Stats <ul><li>Definition of Volcano </li></ul><ul><ul><li>Mountain that forms when molten rock (magma) is forced to the Earth’s surface </li></ul></ul><ul><li>Number of active volcanos = ? </li></ul><ul><ul><li>20 erupting right now (50-60/year) (160/decade) </li></ul></ul><ul><li>Number of volcanologists = 1,500 </li></ul>
  3. 3. <ul><li>Nonexplosive Eruptions </li></ul><ul><li>Explosive Eruptions </li></ul>Volcanic Eruptions What is Lava ? -magma that flows onto the Earth’s surface Lava fountain Lava flow
  4. 4. Volcano Model Demonstration
  5. 5. 1. What did you learn? Write/draw this in your science journal. Volcanoes form around vents that release magma onto the Earth’s surface. Vents Lava Magma chamber
  6. 6. <ul><li>High water content </li></ul><ul><ul><li>More likely to be !!! </li></ul></ul><ul><li>High content </li></ul><ul><ul><li>More likely to be !!! </li></ul></ul><ul><ul><li>Why ? </li></ul></ul><ul><ul><ul><li>Silica has a thick, stiff consistency </li></ul></ul></ul><ul><ul><ul><ul><li>Flows slowly </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Tends to Harden in the volcano’s vent </li></ul></ul></ul></ul>The Composition of Magma Determines whether it is explosive or not! water silica EXPLOSIVE EXPLOSIVE
  7. 7. Explosive Volcano Model Demonstration
  8. 8. <ul><li>a. What physical event causes explosive eruptions? </li></ul><ul><li>b. Would high water content increase the likelihood of having an explosive eruption? </li></ul><ul><li>c. Would high silica content increase the likelihood of having an explosive eruption? </li></ul>2. What did you learn? Write/draw this in your science journal.
  9. 9. What Erupts from a Volcano? Lava can be thick or thin. Blocky lava Pahoehoe Aa Pillow lava
  10. 10. What Erupts from a Volcano? <ul><li>Pyroclastic material </li></ul><ul><li>Rock fragments created by eruptions </li></ul><ul><ul><li>magma explodes from volcano and solidifies in the air </li></ul></ul><ul><ul><li>existing rock is shattered by powerful eruptions </li></ul></ul>Volcanic blocks Volcanic bombs Lapilli Volcanic ash EXPLOSIVE
  11. 11. How do volcanoes affect the Earth? <ul><li>Flows and Fallouts </li></ul><ul><li>hot ash can flow really quickly </li></ul><ul><ul><li>Knock down buildings </li></ul></ul><ul><ul><li>Dam rivers (flooding/drought) </li></ul></ul><ul><ul><li>Kill crops and livestock </li></ul></ul><ul><li>Climatic Changes </li></ul><ul><ul><li>Ash & Gases can block sunlight </li></ul></ul><ul><ul><ul><li>Drop average global temperature noticeably </li></ul></ul></ul>
  12. 12. Types of Volcanoes Shield volcano Cinder cone volcano Composite volcano
  13. 13. Craters, Calderas, and Lava Plateau <ul><li>Crater </li></ul><ul><li>From explosions of material out of the vent and the collapse of material back into vent </li></ul><ul><li>Caldera </li></ul><ul><li>Much larger depression that forms when magma chamber empties and its roof collapses </li></ul><ul><li>Lava Plateau </li></ul><ul><li>Forms when lava erupts from long cracks, or fissures, and spreads out evenly (thousands of km) </li></ul>
  14. 14. What causes volcanoes? <ul><li>The Formation of Magma </li></ul><ul><li>Mantle rock melts when the temperature increases </li></ul><ul><li>or the pressure decreases . </li></ul>
  15. 15. What causes volcanoes? <ul><li>Where Volcanoes Form </li></ul><ul><li>Tectonic Plate Boundaries!!! </li></ul>~75% world’s active volcanoes in Ring of Fire
  16. 16. What causes volcanoes?
  17. 17. What causes volcanoes? Hot Spots
  18. 18. <ul><li>Measuring Small Quakes </li></ul><ul><ul><li>Before eruption, increase in number & intensity </li></ul></ul><ul><li>Measuring Slope </li></ul><ul><ul><li>Bulges may form with magma (tiltmeter) </li></ul></ul><ul><li>Measuring Volcanic Gases </li></ul><ul><ul><li>Outflow of volcanic gases </li></ul></ul><ul><ul><ul><li>Sulfur dioxide, carbon dioxide </li></ul></ul></ul><ul><li>Measuring Temperature from Orbit </li></ul><ul><ul><li>Measure changes in temperature over time </li></ul></ul>How do volcanologists predict eruptions?
  19. 19. You should not be a Volcanologist if…. <ul><li>You don’t like hiking, backbacking, rockclimbing, etc. </li></ul><ul><li>You are not interested in experiencing extreme temperatures and heights. </li></ul><ul><li>If you don’t like to travel to incredible places and see breathtaking views of the world. </li></ul>Robert McGimsey USGS A. Ozerov
  20. 20. Eruption Anticipation Activity
  21. 21. <ul><li>Place 10mL of baking soda in center of a sheet of bathroom tissue. Fold the corners over the baking soda and crease the edges so that they stay in place. Place the tissue packet in the middle of a large disposable pan. </li></ul><ul><li>Put modeling clay around the top edge of a funnel. Turn the funnel upside down over the tissue packet. Press down to make a tight seal. </li></ul><ul><li>Put safety goggles on and add 50mL of vinegar and several drops of liquid dish soap to a 200mL beaker, and stir. </li></ul><ul><li>Predict how much time will elapse before your volcano erupts. WRITE THIS DOWN! </li></ul><ul><li>Pour the liquid into the upturned funnel. Using a stopwatch, record the time you began to pour and the time your volcano erupts. </li></ul><ul><li>How close was your prediction? </li></ul>
  22. 22. <ul><li>a. Was your time prediction close to the real time of eruption? </li></ul><ul><li>b. Are the eruption times similar for every group? If not, give at least one reason why this might be. </li></ul><ul><li>c. How is our experiment different from predicting the eruption of a real volcano? </li></ul>4. What did you learn? Write/draw this in your science journal.

×