4.3 volcanoes
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4.3 volcanoes

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4.3 volcanoes 4.3 volcanoes Presentation Transcript

  • Volcanoes Mr. Silva
  • Vocabulary
  • Vocabulary• Volcano-
  • Vocabulary• Volcano- – Lava and pyroclastoc material built up on the earth’s surface around a vent.
  • Vocabulary• Volcano- – Lava and pyroclastoc material built up on the earth’s surface around a vent.• Volcanism-
  • Vocabulary• Volcano- – Lava and pyroclastoc material built up on the earth’s surface around a vent.• Volcanism- – Any activity that includes the movement of magma toward or onto the earth’s surface.
  • Vocabulary• Volcano- – Lava and pyroclastoc material built up on the earth’s surface around a vent.• Volcanism- – Any activity that includes the movement of magma toward or onto the earth’s surface.• Vent-
  • Vocabulary• Volcano- – Lava and pyroclastoc material built up on the earth’s surface around a vent.• Volcanism- – Any activity that includes the movement of magma toward or onto the earth’s surface.• Vent- – Opening through which molten rock flows onto the earth’s surface.
  • Vocabulary• Magma- – Liquid rock produced deep inside the earth• Lava- – Magma that reaches the earth’s surface• Fissures- – Cracks through which lava flows• Hot Spots- – Areas of volcanism within plates
  • Notes
  • Notes1. Most of the asthenosphere remains solid, because of the great pressure of the surrounding rock
  • Notes1. Most of the asthenosphere remains solid, because of the great pressure of the surrounding rock
  • Notes1. Most of the asthenosphere remains solid, because of the great pressure of the surrounding rock i. Magma forms when mantle material flows to areas of lower pressure, or when fluids such as water are added
  • Notes
  • Notes2. Volcanism involves any activity that includes the movement of magma toward or onto the Earth’s surface
  • Notes2. Volcanism involves any activity that includes the movement of magma toward or onto the Earth’s surface
  • Notes2. Volcanism involves any activity that includes the movement of magma toward or onto the Earth’s surface a. Lava is magma that erupts onto the Earth’s surface
  • Notes2. Volcanism involves any activity that includes the movement of magma toward or onto the Earth’s surface a. Lava is magma that erupts onto the Earth’s surface i. Vent- the opening that molten rock flows through to reach the surface
  • Notes2. Volcanism involves any activity that includes the movement of magma toward or onto the Earth’s surface a. Lava is magma that erupts onto the Earth’s surface i. Vent- the opening that molten rock flows through to reach the surface ii. Volcano- the structure formed by the vent and volcanic material that builds up around the vent
  • Notes Con’t
  • Notes Con’t3. Major Volcanic Zones
  • Notes Con’t3. Major Volcanic Zones a. Subduction Zones
  • Notes Con’t3. Major Volcanic Zones a. Subduction Zones i. When an oceanic and a continental plate meet, the oceanic plate, the oceanic plate subducts, because it is more dense
  • Notes Con’t3. Major Volcanic Zones a. Subduction Zones i. When an oceanic and a continental plate meet, the oceanic plate, the oceanic plate subducts, because it is more dense ii. The subducted plate dives deep into the asthenosphere, causing water to combine with nearby mantle material
  • Notes Con’t3. Major Volcanic Zones a. Subduction Zones i. When an oceanic and a continental plate meet, the oceanic plate, the oceanic plate subducts, because it is more dense ii. The subducted plate dives deep into the asthenosphere, causing water to combine with nearby mantle material iii. This forms magma
  • Notes Con’t3. Major Volcanic Zones a. Subduction Zones i. When an oceanic and a continental plate meet, the oceanic plate, the oceanic plate subducts, because it is more dense ii. The subducted plate dives deep into the asthenosphere, causing water to combine with nearby mantle material iii. This forms magma iv. Some magma erupts through the Earth’s surface forming:
  • Notes Con’t3. Major Volcanic Zones a. Subduction Zones i. When an oceanic and a continental plate meet, the oceanic plate, the oceanic plate subducts, because it is more dense ii. The subducted plate dives deep into the asthenosphere, causing water to combine with nearby mantle material iii. This forms magma iv. Some magma erupts through the Earth’s surface forming: 1. Volcanic mountains- where a continental plate collides with an oceanic plate
  • Notes Con’t3. Major Volcanic Zones a. Subduction Zones i. When an oceanic and a continental plate meet, the oceanic plate, the oceanic plate subducts, because it is more dense ii. The subducted plate dives deep into the asthenosphere, causing water to combine with nearby mantle material iii. This forms magma iv. Some magma erupts through the Earth’s surface forming: 1. Volcanic mountains- where a continental plate collides with an oceanic plate 2. Island arcs- where two oceanic plates collide
  • Notes
  • Notesb. Mid-Ocean Ridges
  • Notesb. Mid-Ocean Ridges i. As the plates pull apart, magma wells up along the rift zone 1. The magma adds new lithosphere to the ridge
  • Notesb. Mid-Ocean Ridges i. As the plates pull apart, magma wells up along the rift zone 1. The magma adds new lithosphere to the ridge
  • Notesb. Mid-Ocean Ridges i. As the plates pull apart, magma wells up along the rift zone 1. The magma adds new lithosphere to the ridgec. Hot Spots
  • Notesb. Mid-Ocean Ridges i. As the plates pull apart, magma wells up along the rift zone 1. The magma adds new lithosphere to the ridgec. Hot Spots i. Volcanoes that do not form at plate boundaries
  • Notesb. Mid-Ocean Ridges i. As the plates pull apart, magma wells up along the rift zone 1. The magma adds new lithosphere to the ridgec. Hot Spots i. Volcanoes that do not form at plate boundaries ii. Hot spot is beneath the lithospheric plate, and the plate moves over it