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Volcano notes


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This presentation was used to present information about volcanoes to sixth grade students

Published in: Economy & Finance, Technology
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Volcano notes

  1. 1. Volcano Notes By Mrs. Sabol
  2. 2. What is a volcano? <ul><ul><li>Any opening in earth’s crust that allows magma or gases to escape earth’s crust. </li></ul></ul>
  3. 3. How it forms. <ul><li>Magma mixes with gases in the mantle. </li></ul><ul><li>Collects in magma pools in the crust </li></ul><ul><li>Reduction in pressure causes an eruption </li></ul>
  4. 4. Types of volcanoes Cinder cone Shield Cone Strato volcano
  5. 5. Types of volcanoes Shield Volcano <ul><li>1. Lava quietly flows from the vent. </li></ul><ul><li>Mountain covers a large area. </li></ul><ul><li>Sides are gently sloped </li></ul><ul><li>Dome shaped mountain </li></ul><ul><li>5. Example: Moana Loa </li></ul>
  6. 6. TYPES OF VOLCANOES CINDER CONE <ul><li>Cinder and rock particles are thrown into the air. </li></ul><ul><li>Steep sides </li></ul><ul><li>Usually smaller in size </li></ul><ul><li>Example: Paracutin, Mexico </li></ul>
  7. 7. TYPES OF VOLCANOES Strato volcanoes <ul><li>Violent eruption of tephra, followed by quiet lava flow. </li></ul><ul><li>Large mountain </li></ul><ul><li>Sides are steep. </li></ul><ul><li>Examples: Mt. Fuji, Japan, Mt. St. Helen’s, Mt. Vesuvius </li></ul>
  8. 8. Types of volcanoes Classified by how often they erupt Active - erupting constantly - Moana Loa Intermittent - erupt on a regular basis -Mt. Vesuvius Dormant - have not erupted in a while, but could in the future - Mt. Lassen Extinct - have not erupted in written history - Mt. Kenya
  9. 9. Where are they found?
  10. 10. Warning signs <ul><li>Increase in earthquakes </li></ul><ul><li>Bulges in the mountain </li></ul><ul><li>Change in harmonic tremors </li></ul><ul><li>Smoke or dust coming from a vent </li></ul><ul><li>Change in seismometer or tiltmeter readings </li></ul><ul><li>Increase in sulfur dioxide </li></ul><ul><li>Lava dome doubled in size </li></ul>
  11. 11. <ul><li>Long term effects </li></ul><ul><li>Volcanic dust </li></ul><ul><li>A. May remain in the jet stream for several years. </li></ul><ul><li>B, May block sunlight </li></ul><ul><li>C. May reduce the average temperature of the earth, which may reverse the greenhouse effect </li></ul><ul><li>Property destruction </li></ul><ul><li>Loss of lives </li></ul><ul><li>Create fertile soil and increase new plant life. </li></ul><ul><li>Vivid sunsets </li></ul><ul><li>Acid rain </li></ul>Effects of volcanoes
  12. 12. Resultant effect of volcanoes (Sudden or instantaneous) <ul><li>Pyroclastic flow or surge </li></ul><ul><li>Lahars </li></ul><ul><li>Ash </li></ul><ul><li>Lava </li></ul><ul><li>Earthquakes </li></ul><ul><li>Changes in the biosphere, cryosphere and atmosphere </li></ul>