Worksheetschapter 4 (volcanos) practice test
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
Before molten rock reaches the surface, it is called _____.
a)
magma
b)
ash
c)
minerals
d)
lava
2.
Volcanic belts form along _____.
a)
the boundaries of Earth’s plates
b)
North American mountain ranges
c)
islands in the Pacific Ocean
d)
the middle of Earth’s plates
3.
The formation of the Hawaiian Islands is one example of _____.
a)
volcanoes forming over a hot spot
b)
volcanoes forming along plate boundaries
c)
the Ring of Fire
d)
continental drift
4.
What is molten rock called once it reaches the surface?
a)
lava
b)
rock
c)
ash
d)
magma
5.
The volcanoes along converging oceanic plate boundaries may form _____.
a)
an island arc
b)
a part of the mid-ocean ridge
c)
a hot spot
d)
a subducting plate
6.
Volcanoes that form along a mid-ocean ridge occur at a(n) _____.
a)
diverging plate boundary
b)
ring of fire
c)
hot spot
d)
a subducting plate
7.
A major volcanic belt known as the _____ circles the Pacific Ocean.
a)
Ring of Fire
b)
Island Arc
c)
Hot Spot
d)
Diverging Plate
8.
Mountains that are formed by volcanoes along a coastline occur at _____.
a)
converging plate boundaries
b)
diverging plate boundaries
c)
hot spots
d)
mid-ocean ridges
9.
How does an island arc form?
a)
two oceanic plates collide
b)
a hot spot develops in the middle of an oceanic plate
c)
an oceanic plate and a continental plate converge
d)
a mid-ocean ridge enlarges
10.
What is the long tube in the ground that connects the magma chamber to Earth’s surface?
a)
pipe
b)
magma tube
c)
vent
d)
crater
11.
What provides the force that causes magma to erupt to the surface?
a)
Dissolved gases trapped in the magma.
b)
The silica in the magma.
c)
Gravity in the lithosphere.
d)
The density of the magma.
12.
The bowl-shaped area around a volcano’s central vent is called a(n) _____.
a)
crater
b)
magma
c)
lave flow
d)
side vent
13.
Where is the vent found in the volcano?
a)
At the top where lava flows out.
b)
Below the main body of the volcano.
c)
Between the magma chamber and the pipe.
d)
Below the lava flow.
14.
As magma rises towards the surface _____.
a)
the dissolved gases form bubbles
b)
CO2 is added from the side vents[
c)
pressure from the surrounding rock increases
d)
the temperature increases
15.
How does the release of trapped gases in magma cause a volcano to erupt?
a)
The gases rush out and carry the magma with them.
b)
The gases form vents that allow the magma to flow out.
c)
They push the magma up the pipe and then are reabsorbed into the magma chamber.
d)
They cause the magma to change chemically into lava.
16.
_____ is the area covered by lava.
a)
lava flow
b)
main crater
c)
side vent
d)
magma chamber
17.
The magma chamber is found _____
a)
beneath the volcano
b)
between the pipe and the crater
c)
at the top where lava flows out
d)
below the lava flow
18.
A magma’s viscosity is directly related to its ____.
a)
silica content
b)
age
c)
color
d)
depth
19.
Which factor helps determine whether a volcanic eruption will be explosive or relatively quiet?
a)
amount of dissolved gases in the magma
b)
temperature of the surrounding atmosphere
c)
size of the original magma chamber
d)
distance from a plate boundary
20.
What is the temperature range for magma and lava?
a)
750°C to 1,175°C
b)
50°C to 75°C
c)
2,175°C to 3,500°C
d)
150°C to 350°C
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