QUIZ 6
1. The Hawaiian Islands are composed of what type of volcanoes?
o
A) shield
2. The degree to which a substance resists flow is known as _______.
o
E) viscosity
3. The igneous rock in the figure above has what type of texture?
o
A) glassy
4. A _______ is a mixture of molten and solid rock.
o
C) fractional melt
5. The figure above is an igneous rock with what type of texture?
o
A) vesicular
6. The figure above has what type of texture?
o
D) porphyritic
7. Which of the following terms best describes the lava in the figure above?
o
A) low viscosity
8. The smallest type of tephra is known as _______.
o
B) volcanic ash
9. Fine grained igneous rocks have a _______ texture.
o
A) aphanitic
10. Tsunamies, tremors, lahar, changes in global temperature, and acid rain are
secondary hazards associated with _____________
o
B) earthquakes
11. Rock textures associated with rocks formed internally produce _________and
externally form produce _______________ respectively.
o
A) large and small crystals
12. A sill is a ______________ intrusion, whereas a dike is a ______________
intrusion.
o
D) horizontal, vertical
13. Volcanoes are located in which type of plate boundaries?
o
C) convergent (subduction zone)
True/False
14. The presence of higher amounts of water usually lowers the melting
temperature of the rock.
o
TRUE
15. Hawaiian eruptions are extremely violent and produce large pyroclastic flows.
o
FALSE
16. Igneous rocks high in feldspars and silicates are known as felsic rocks.
o
TRUE
17. Vulcanian eruptions are not very explosive and only release ash 5km into the
air.
o
FALSE
18. Igneous rocks with small crystals undergo slow cooling.
o
FALSE
Fill-In-The-Blank
19. The most violent volcanic eruptions in history are classified as _______
eruptions. PLINIAN
20. When magma is injected horizontally between layers and solidifies, a
_______ forms. SILL