9th Grade Chapter 8 Lesson 3

  • 2,139 views
Uploaded on

For Student Use Only

For Student Use Only

More in: Technology , Education
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
    Be the first to like this
No Downloads

Views

Total Views
2,139
On Slideshare
0
From Embeds
0
Number of Embeds
1

Actions

Shares
Downloads
0
Comments
0
Likes
0

Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. 9 th Grade Chapter 8 Lesson 3 Pgs. 213-223 For student Use Only
  • 2. Volcanoes
    • Volcano:
      • Most violent naturally occuring disaster
      • God also can control the volcano
    • Volcano Structure:
      • Volcano- opening in earth’s surface where gases, ash, and molten rock are ejected
  • 3. Volcanoes
    • Volcano:
      • Parts of the Volcano:
        • Vent: central channel
        • Magma: magma is molten rock lies below the surface
        • Cone: dust, ash, and magma can make a conical-shaped mountain
        • Crater: bowl-shaped depression that surrounds the vent
  • 4. Volcanoes
    • Types of Volcanoes:
      • Cinder-Cone: composed of volcanic ash and rock fragments (cinders)
      • Shield: Larger, flatter volcanoes made from runny lava
      • Composite: Composed of layers of cinders and lava
  • 5. Volcanoes
    • Volcanic Activity:
      • Active: Erupted in last 50 years
      • Dormant: has not erupted in many years
      • Extinct: A volcano that will PROBABLY not erupt again
  • 6. Volcanoes
    • Volcano Location:
      • Three main belts (like three main earthquake belts:
        • 1. Ring of Fire- 25% of Earth’s 850 Active volcanoes are there
        • 2. Mediterranean Trans-Asiatic- (Europe to Asia)
        • 3. Mid-Ocean Ridges- mid-ocean
        • ALSO- Some volcanoes are in West Indies and African Rift Valley
  • 7. Volcanoes
    • Volcano Eruptions:
      • Violent eruptions- more powerful than an atomic bombs
    • Signs of Eruptions:
      • 1. Swelling, Bulging in part of volcano (due to magma and gasses)
      • 2. Minor Earthquakes begin
      • 3. Explosion of Gas, Dust, and Steam
  • 8. Volcanoes
    • Volcano Eruptions:
      • Huge rock pieces get thrown into the air
      • Lava can erupt violently or dribble out
        • Depends on
          • Viscosity: viscosity (how it flows)
          • Amount of gas in magma
      • Sometimes (like Nevado De Ruiz) huge mud flows can accompany eruption
  • 9. Volcanoes
    • Solid Ejecta:
      • Pyroclasts: solid particles or blocks of rock
      • Volcanic Ash: pyroclast that is less than 4 mm
      • Cinders: pyroclast that is less than 32mm but more than 4mm
      • Volcanic blocks: solid, irregular lumps of lava
      • Volcanic bombs: lava that is thrown high in the air
  • 10. Volcanoes
    • Volcanic Ejecta:
      • Fiery Blasts:
        • Lava is not usually very fast
        • Super heated gas and Incandescent ash are very dangerous
        • Superheated gas can blow as fast as the wind
        • Nuee Ardente: heated gas and volcanic ash act as an avalanche (glowing avalanche) (Mt. Pelee)
  • 11. Volcanoes
    • Volcanic Structures:
      • Calderas- sunk in hole- bowl shaped surface of crater
      • Tunnels- lava hardens on top and then continues to flow under the surface
  • 12. Volcanoes
    • Volcanic Intrusions:
      • Igneous Intrusion: Magma rock forces up surface of earth
      • Dike: Vertical sheet of magma that hardens in a vertical fissure
      • Sill: horizontal sheet of magma
      • Laccolith: magma rock pushes surrounding surface up
      • Batholith: large magma rock deposit