Volcanoes

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Volcanoes

  1. 1. Understanding Volcanoes
  2. 2. What is a volcano? Volcano is an opening in the earth’s crust where lava, pyroclasts and gasses are ejected onto the surface during eruptions. Mt. Mayon Mt. Kilauea Mt. Vesuvius
  3. 3. Parts of a Volcano  Cone- the most prominent part of a volcano -formed by the mountainous accumulation of volcanic materials Mt. Mayon
  4. 4. Parts of a Volcano  Crater- a steeped-wall *Caldera-a very large depression at the peak of crater that can the volcano and the exceed for about 1 volcanic vent. km in diameter; they are formed when the summit of the volcano collapses during violent or explosive eruptions.
  5. 5. Lava vs. Magma Magma are molten rocks found beneath the earth’s surface. Lava are molten rocks that flowed out of the earth’s surface.
  6. 6. Kinds of Volcano according to Shape and Composition  Cinder cone volcano- made up of loose fragments called cinders (pyroclasts and tephra) -it is formed from explosive eruption. -it has a narrow base and a steep slope Examples: Sunset Crater in Arizona, Mt. Pelee’ in the East Indies
  7. 7. Kinds of Volcano according to Shape and Composition  Shield cone volcano- has a wide base with gently sloping sides. It is made up purely of solidified lava. Examples: Mauna Kea and Kilauea Volcano in Hawaii, Olympus Mons in Mars
  8. 8. Kinds of Volcano according to Shape and Composition  Composite Volcano- composed of alternating layers of lava and cinders. It is formed when volcanic eruptions vary between quiet and violent and explosive. Examples: Mt. Fuji in Japan, Mt. Vesuvius and Mt. Stromboli in Italy and Mt. Mayon in the Philippines
  9. 9. Kinds of Volcano according to Activity Active Dormant/Inactive Extinct
  10. 10. Kinds of Volcanic Eruption  Violent or Plinian Eruption
  11. 11. Kinds of Volcanic Eruption  Non-explosive or Quiet Eruption
  12. 12. Benefits of Volcanic Eruption agricultural benefits  energy benefits industrial benefits tourism and recreational benefits
  13. 13. Dangers of Volcanic Eruption volcanic gasses  lava flows  lahar  global warming
  14. 14. Before a Volcanic Eruption
  15. 15. During a Volcanic Eruption
  16. 16. After a Volcanic Eruption

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