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Volcanoes by Jake Pirotta, 3.04
 

Volcanoes by Jake Pirotta, 3.04

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  • Talk about this volcano when it erupted and what it is doing right now.
  • MASS, DENSITY, AND ESCAPE VELOCITY The Earth's mass is about 5.98 x 10 24 kg. The Earth has an average density of 5520 kg/m3 (water has a density of 1027 kg/m3). Earth is the densest planet in our Solar System. To escape the Earth's gravitational pull, an object must reach a velocity of 24,840 miles per hour (11,180 m/sec).
  • There are lots of uncertainties about why volcanoes form, because scientists have to rely on models based on rock samples and other data.
  • There are lots of uncertainties about why volcanoes form, because scientists have to rely on models based on rock samples and other data.

Volcanoes by Jake Pirotta, 3.04 Volcanoes by Jake Pirotta, 3.04 Presentation Transcript

  • By Jake Pirotta, 3.04
    • Definition of Volcano
      • Mountain that forms when molten rock is forced to the Earth’s surface
    • Number of active volcanos
      • 20 erupting right now (50-60/year) (160/decade)
    • Number of volcanologists = 1,500
    • Nonexplosive Eruptions
    • Explosive Eruptions
    Volcanic Eruptions
  • Volcanoes form around vents that release magma onto the Earth’s surface. Magma chamber
  • Lava can be thick or thin . Blocky lava Pillow lava
  • What Erupts from a Volcano?
    • Pyroclastic material
    • Rock fragments created by Explosive eruptions
      • magma explodes from volcano and solidifies in the air
      • existing rock is shattered by powerful eruptions
    Volcanic blocks Volcanic bombs Lapilli Volcanic ash
  • How do volcanoes affect the Earth?
    • Flows and Fallouts
    • hot ash can flow really quickly
      • Knock down buildings
      • Dam rivers (flooding/drought)
      • Kill crops and livestock
    • Climatic Changes
      • Ash & Gases can block sunlight
        • Drop average global temperature noticeably
  • Types of Volcanoes Shield volcano Cinder cone volcano Composite volcano
  • Craters, Calderas, and Lava Plateau
    • Crater
    • From explosions of material out of the vent and the collapse of material back into vent
    • Caldera
    • Much larger depression that forms when magma chamber empties and its roof collapses
    • Lava Plateau
    • Forms when lava erupts from long cracks, or fissures, and spreads out evenly (thousands of km)
  • What causes volcanoes?
    • The Formation of Magma
    • Mantle rock melts when the temperature increases
    • or the pressure decreases .
  • What causes volcanoes?
    • Where Volcanoes Form
    • Tectonic Plate Boundaries!!!
  • What causes volcanoes?
  • What causes volcanoes? Hot Spots
    • Measuring Small Quakes
      • Before eruption, increase in number & intensity
    • Measuring Slope
      • Bulges may form with magma (tiltmeter)
    • Measuring Volcanic Gases
      • Outflow of volcanic gases
        • Sulfur dioxide, carbon dioxide
    • Measuring Temperature from Orbit
      • Measure changes in temperature over time
    • You don’t like hiking, backbacking, rockclimbing, etc.
    • You are not interested in experiencing extreme temperatures and heights.
    • If you don’t like to travel to incredible places and see breathtaking views of the world.