Volcanoes
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Volcanoes

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Volcanoes Presentation Transcript

  • 1. All you need to know about Volcanoes
  • 2. I Magma – rocks exist as magma deep with in the Earth’s crust II. Lava – magma that reaches the Earth’s surface
  • 3. III. Volcano – the place in the Earth’s surface through which magma and other materials reach the surface IV. Vent – opening in which lave erupts – sometimes has more than one.
  • 4. I. Cinder cones – made mostly of cinders and rock particles a. Explosive eruptions b. Not high but have a narrow base and steep sides c. Izalco in El Salvador and Paricutin in Mexico
  • 5. a. Quiet flows b. Flows over a large area c. Dome-shaped d. Mauna Loa on Kilauea in Hawaii (Forms over a hot spot)
  • 6. a. Made up of alternating layers of rock particles and lava b. First eruption violent, second eruption quiet (this is continuous until the volcano is formed) c. Mount Etna in Italy
  • 7. I. II. III. IV. Some volcanoes erupt regularly, others haven’t erupted with in modern history. Active volcano – is one that erupts either continually or periodically. Dormant volcano – one that has been known to erupt in modern history but is inactive now. Extinct volcano – one that has not been known to erupt in modern history
  • 8. I. Most major earthquakes and volcanic eruptions occur in three zones of the world. Scientists believe that there is great deal of movement and activity in the Earth’s crust in these zones.
  • 9. II. Ring of Fire – zone goes through the edge New Zealand, the Philippines, Japan, Alaska, and along the western coast of North and South America.  Mediterranean Zone – extends across Asia into India III. Iceland to the middle of the Atlantic Ocean Iv. Mid-Atlantic Ridge – long mountain range of volcanic mountains under the Atlantic Ocean V. New parts of the Earth are forming in this area.