Structures (Chapter 3) **

Question 1

True or False: The higher the viscosity, the more explosive

Answer 1

True

Question 2

What causes viscosity to increase and decrease?

Answer 2

SiO2 content causes it to increase. Temperature and H20 content causes it to decrease.

Question 3

Central vent landforms

Answer 3

Shield volcano, stratovolcano, dome, and cinder cone

Question 4

Volcano complexes

Answer 4

Large areas with multiple volcanic activities lasting thousands of years

Question 5

Small central vent landforms

Answer 5

Scoria cones, maars, tuff rings, tuff cones

Question 6

Scoria cones

Answer 6

Result from collection of airborne ash, lapilli, and blocks as they fall around a central vent from weak explosive activity

Question 7

Maar

Answer 7

Large crater with small ring of debris formed from the explosive interaction of hot magma with groundwater

Question 8

Tuff rings

Answer 8

Formed from rising magma that interacts with ground/surface water. Shallower than a maar

Question 9

Domes

Answer 9

Formed from degassed, viscous, silicic magma that moves slowly and quietly to the surface
(mineral deposits associated)

Question 10

Pressure ridges

Answer 10

Flow features associated with downhill flow from domes showing convex shape

Question 11

Calderas

Answer 11

Large scale volcanic depressions that are covered by sedimentary rock. (when a volcano sinks into the ground)