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Chap 9 And 10
Test Description: Plate tectonics and Volcanoes
Instructions: Answer all questions to get your test result.
1) How does the age of the seafloor sediments change with increasing distance from the ocean ridge
A
age stays the same
B
age decreases
C
age increases
D
age varies without a pattern
2) The main source of downwarnd convective flow in the mantle is called
A
slab pull
B
ridge push
C
ridge pull
D
slab push
3) The downward sliding characteristic of ridge push is the result of
A
uneven heat distribution
B
paleomagnetism
C
gravity
D
continental rifting
4) The thermal convection that drives plate motion is caused by
A
gravity
B
an unequal distribution of heat
C
subduction
D
seafloor spreading
5) According to whole mantle convection
A
slabs of cold oceanic lithosphere move down and into the lower mantle
B
material from the inner core rises into the mantle to form super hot plumes
C
large chunks of continental crust are pulled down into the lower mantle
D
small amounts of material from the lower mantle move upward to the surface
6) A magmas viscosity is directly related to its
A
age
B
color
C
silica content
D
depth
7) Which of the following factors help determin whether a volcanic eruption will be violent of relatively quiet
A
all the answers listed
B
temperature of the magma
C
composition of the magma
D
amount of dissolved gases in the magma
8) As the temperature of lava increases
A
its viscosity increases
B
it hardens
C
it can flow a shorter distance
D
its viscosity decreases
9) Highly explosive volcanoes tend to have what type of magma?
A
magma with no silica, high viscosity, and no gas content
B
magma with low silica, low viscosity, and lower gas content
C
magma with low silica, high viscosity, and lower gas content
D
magma with high silica, high viscosity, and higher gas content
10) A volcanic bomb is a
A
piece of semi mmolten rock ejected as glowing lava
B
very violent volcanic eruption
C
tiny particle of ejected rock less than 64mm in size
D
pocket of gas that is relleased suddenly
*select an answer for all questions
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