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WorksheetsVolcanoes
Total questions: 20
Worksheet time: 26mins
Name
Class
Date
1.
Which types of magma contains the least amount of SiO2
a)
rhyolitic
b)
andesitic
c)
felsic
d)
basaltic
2.
Rhyolitic magma is rich in _____.
a)
silica
b)
iron
c)
magnesium
d)
sulfur
3.
Which of the following is not a factor that can affect magma composition
a)
lacosity
b)
mineral content
c)
silica
d)
water content
4.
The composition of magma determines its _____.
a)
viscosity
b)
darkness
c)
color
d)
none of the above
5.
Which of the following gases is not typically found in volcanic activity?
a)
water vapor
b)
sulfur
c)
carbon dioxide
d)
argon
6.
Volcanoes that are made of basalt lava flows are called _____.
a)
shield volcanoes
b)
composite volcanoes
c)
stratovolcanoes
d)
cone volcanoes
7.
Volcanoes are common along
a)
convergent plate boundaries.
b)
divergent plate boundaries.
c)
transform plate boundaries.
d)
two of the above
8.
About 75 percent of the world’s volcanoes are found
a)
around the Atlantic Ocean basin.
b)
along the mid-Atlantic ridge.
c)
around the Pacific Ocean basin.
d)
throughout the American Northwest.
9.
A line of volcanic activity that surrounds the Pacific Ocean basin is the
a)
Ring of Fire
b)
Aleutian Islands
c)
Hawaiian Islands
d)
Caribbean Islands
10.
Which of these volcanic particulates is the largest in size?
a)
Block
b)
Ash
c)
Bomb
d)
Lapilli
11.
This volcano is most likely which type of volcano?
a)
Felsic
b)
Composite
c)
Shield
d)
Cinder cone
12.
What is a determining factor in which type of eruption will occur?
a)
the chemistry of the magma
b)
the size of the mountain
c)
the climate around the volcano
d)
the number of people living near the volcano
13.
Which of the following factors helps determine whether a volcanic eruption will be violent or relatively quiet?
a)
amt of dissolved gases
b)
temp of magma
c)
composition of magma
d)
all of the above
14.
A lava flow with a surface of rough, jagged blocks and sharp, angular projections is called a(n) ____.
a)
pyroclastic flow
b)
aa flow
c)
pahoehoe flow
d)
ash flow
15.
As the temperature of lava increases, ________
a)
its viscosity decrease
b)
it begins to harden
c)
its viscosity increases
d)
it can flow a much short distance
16.
Which list places the magma types in order of decreasing viscosity (most viscous listed first)?
a)
basaltic, andesitic, rhyolitic
b)
rhyolitic, andesitic, basaltic
c)
andesitic, basaltic, rhyolitic
d)
basaltic, rhyolitic, andesitic
17.
Highly explosive volcanoes tend to have what type of magma?
a)
magma with high silica, high viscosity, and higher 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 no silica, high viscosity, and no gas content
18.
The particles produced in volcanic eruptions are called ____.
a)
laccoliths
b)
pyroclastic material
c)
calderas
d)
volcanic stocks
19.
What is the most abundant gas associated with volcanic activity?
a)
chlorine
b)
water vapor
c)
sulfur oxide
d)
carbon dioxide
20.
What type of volcano is built almost entirely from ejected lava fragments?
a)
cinder cone
b)
composite cone
c)
shield volcano
d)
pahoehoe volcano
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