Volcanoes

1
Volcanoes
Abby Budin, Amanda Miller and Nikki Prior SCI 210
Geology October 12, 2005
2
Shield Volcano

• Form of Volcano Slightly Sloped 6-12 degrees
• Size Up to 9000m high
• Type of Magma Basalt
• Style of Activity Gentle, some fire fountains
• Examples Hawaii

3
Mauna Loa

• Mauna Loa, the largest of the shield volcanoes,
  is 13,677 feet above sea level, which means it
  rises over 28,000 feet above the deep ocean
  floor, and would be the worlds tallest mountain
  if much of it were not underwater.

4
Cinder Cone

• Form of Volcano Moderate slope
• Size 100-400m high
• Type of Magma Basalt or andesite
• Style of Activity Ejections of pyroclastic
  material
• Examples Paricutin, Mexico

5
Mount Shasta
Medicine Lake
6
Composite Volcano

• Form of Volcano Alternate layers of flows and
  pyroclastics
• Size 100-3500m high
• Type of Magma Variety of types of magmas and ash
• Style of Activity Often violent
• Examples Vesuvius, Mount St. Helens, Aconcagua

7
Mount Hood
Mount Fuji
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How do volcanoes affect climate?

• Ash and gas spewed
• Some falls or washes out, some shoot into
  stratosphere
• Ash and gas in stratosphere causes haze
• Haze shades and cools Earth enough to cause a
  climate change
• Pinatubo in Philippines (1991)
• 15 million tons of sulfur dioxide
• Solar radiation declined 2-4
• Temperature rose again in 1994
• Put more aerosols into the stratosphere than any
  other volcano in the 20th century
• http//earthbulletin.amnh.org/D/3/1/

9
Vesuvius

• 79 A.D.
• Destroyed Roman cities of Pompeii, Herculaneum
  and several neighboring villages near what is now
  Naples, Italy.
• Buried the villages 5-8m of hot ash
• Inactive for 700 years prior to the eruption.

10
Krakatoa

• 1883
• SW Pacific Ocean
• Generated tsunamis
• Killed 36,000 people

11
Resources

• TITLE PAGE
• http//www.wallys.com/art/volcanoe.jpg
• SHIELD
• http//www.windows.ucar.edu/tour/link/earth/inter
  ior/shield_volcanos.html
• http//library.thinkquest.org/17457/volcanoes/type
  s.shield.php
• CINDER CONE
• http//pubs.usgs.gov/gip/volc/types.html
• Mount Shasta
• http//vulcan.wr.usgs.gov/Volcanoes/Shasta/images.
  html
• Medicine Lake
• http//vulcan.wr.usgs.gov/Imgs/Jpg/MedicineLake/gl
  ass_mtn.jpg
• COMPOSITE
• http//pubs.usgs.gov/gip/volc/types.html
• Mt. Fuji
• http//www.denney-net.co.uk/Kawaguchiko20Mount20
  Fuji.jpg
• Mount Hood
• http//www.taphilo.com/photo/pictures/Mount-Hood.j
  pg
• ANCIENT VOLCANIC ERUPTIONS
• Vesuvius