Lesson 8-What is vulcanicity?

Question 1

Basaltic lavas

Answer 1

• Low silica content
• 1160 temp
• Low viscosity
• Low aggressive eruptions
• Frequent
• Shield volcanoes

Question 2

Andesitic/Rhyolitic lavas

Answer 2

• High silica comntent
• 900 temp
• High viscosity
• Violent eruptions
• Infrequent
• Composite

Question 3

VEI

Answer 3

• A logrythmic measurement of the magnitude of a volcanic eruption

Question 4

Contrast between Hawaiian eruptions and Plinian eruptions

Answer 4

• Hawaiian erupts frequently wheres Plinian doesnt
• Hawiian less than 0.00001 km but Plinian was less than 1km
• Hawaiin is effusive and Plinian is paroxymal

Question 5

VEI evaluation

Answer 5

+Preperation-prevents damage and injuries
-Large range of size between volcanoes

Question 6

Strato volcanoe

Answer 6

• Explosive
• Composite-steep sided
  -contain complex networks of lava flows
  -could be pyroclastic flow
  -Mt Fuji,St Helens

Question 7

Cilinder Cone volcano

Answer 7

• Explosive
• Layers of fine ash
  -side vents/single volcanoes
  -Smith Volcano,Philipines

Question 8

Caldera volcano

Answer 8

• Explosive
• Large Pillian eruptions that send ash into stratosphere
• Crater lake in Oregon

Question 9

Acid Dome volcano

Answer 9

• Explosive
• Ejects acid lava, violent due to the explosive pressures building up in the magma
• Krakatoa in Indonesia

Question 10

Shield vocano

Answer 10

• Effusive
  -gently sloping sides that are formed by highly fluid lava thats usually basaltic that can flow on the surface for long distances
  -Mauana Loa, Hawaii

Question 11

Fissure

Answer 11

• Effusive
• Erupts from linear structure on earths surface
• Produces lava flows that travel great distances or even pyroclastic flows and gases
• Siberian Traps