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Chapter 10 section 1
volcanoes and other igneous
          activity
viscosity
•   Is a substances resistance to
    flow
•   Temperature on viscosity easy
    to see
•   Mobility of lave str...
Dissolved gasses
•   During eruption ,the gasses
    trapped in magma provide the
    force to eject molted rock
•   Vent-...
Lava flow
o Most lava is very fluid because
  of the low amount of silica
o Flow rate at 10 to 300 meters
  per hour
o Sil...
Pyroclastic materials
• When lava is extruded
• Some ejected lava may land
  near the vent and forma
  cone shape
• Wind w...
Type of volcano
• They’re three main
  volcanic type
  – Shield volcanoes
  – Cinder cones
  – Composite cones
• Anatomy o...
Shield volcanoes
• Are produced by the
  accumulation of fluid basaltic
  lavas
• Shape of broad slightly
  domed
• Most h...
Cinder cones
•   Ejects lava which hardens in the
    air
•   Range in size from fine ash to
    bombs but mostly lapilli
...
Composite cones
•   Most beautiful but also most
    dangerous
•   Also known as stratovolcanoes
•   Located in relatively...
Lava plateaus
• Greatest volume of
  volcano excrete from
  fissures
• Columbia plateau was
  formed this way
• Numerous f...
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Chapt10.1 volcanoes

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Chapt10.1 volcanoes

  1. 1. Chapter 10 section 1 volcanoes and other igneous activity
  2. 2. viscosity • Is a substances resistance to flow • Temperature on viscosity easy to see • Mobility of lave strongly affected by temperature • Chemical composition of magma has more important affect on the type of eruption • The more silica in magma the greater it is viscosity – High silica means slower flow – Lower silica faster flow
  3. 3. Dissolved gasses • During eruption ,the gasses trapped in magma provide the force to eject molted rock • Vent-an opening to the surface. • Mostly water vapor and carbon dioxide • Fluid basaltic magma allows expanding gases to bubble upward and escape easily • Most are quite
  4. 4. Lava flow o Most lava is very fluid because of the low amount of silica o Flow rate at 10 to 300 meters per hour o Silica rich lava is slower o When basaltic lava harden it makes a smooth skin that wrinkles known as Pahoehoe o Aa is another form of basaltic lava o Rough jagged blocks o With dangerously sharp edges
  5. 5. Pyroclastic materials • When lava is extruded • Some ejected lava may land near the vent and forma cone shape • Wind will carry small partials a long way • The fragment ejected during eruption range in size from very fine dust and volcanic dust to pieces that weigh several tons
  6. 6. Type of volcano • They’re three main volcanic type – Shield volcanoes – Cinder cones – Composite cones • Anatomy of a volcano – Activity often begins when a fissure or develops in the crust
  7. 7. Shield volcanoes • Are produced by the accumulation of fluid basaltic lavas • Shape of broad slightly domed • Most have grown from the deep of the ocean • Including Hawaiian island and Iceland
  8. 8. Cinder cones • Ejects lava which hardens in the air • Range in size from fine ash to bombs but mostly lapilli • Produce gas rich basaltic magma • Come in simple shapes • Shape determined by steep- sided slope • Last only a couple of weeks • because of short life span cinder cones are small between 30 to 300 miters
  9. 9. Composite cones • Most beautiful but also most dangerous • Also known as stratovolcanoes • Located in relatively narrow zones – Pacific ocean (ring of fire) • Cascade range, mount. St. Helen, mount. Rainier, and mount. garibaldi • Most activity are located in the curved belts of volcano island
  10. 10. Lava plateaus • Greatest volume of volcano excrete from fissures • Columbia plateau was formed this way • Numerous fissure erupted their • Some go up to50 miters thick but some only 1.6 miters thick

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