Focus On Earth Science: California Grade 6

Chapter 7: Volcanoes

Standards Review

1.
Magma rises above rock from which it melts because magma _________. 1.d
A)has greater density than the rock
B)has less density than the rock
C)has the same density as the rock
D)has no density
2.
Which of these form away from plate boundaries? 1.d
A)fissure eruptions
B)hot spots
C)island arcs
D)volcanic arcs
3.
Volcanic mountains are formed by __________. 1.e
A)the deposition of molten rock
B)uplifting
C)erosion
D)folding
4.
What do colliding plates have to do with volcanoes? 1.d
A)The plate that gets pushed up creates a volcano.
B)Colliding plates have nothing to do with volcanoes.
C)The plate that gets pushed underground melts to become magma.
D)The plates that separate create a volcano.
5.
Why do so many volcanoes form on divergent and convergent plate boundaries? 1.e
A)These plate separate to create volcanoes.
B)Converging and diverging plates have nothing to do with volcanoes.
C)These plates get pushed up and create volcanoes.
D)because melting plates cause magma to form beneath the surface.
6.
What kind of eruptions are responsible for most of the rock found on Earth's surface? 1.e
A)highly viscous lava eruptions
B)explosive eruptions
C)deep-sea eruptions
D)fissure eruptions
7.
What is the connection between volcanoes and plate tectonic movement? 1.d
A)Plate movement causes rock to harden and cool underground.
B)No connection exists between volcanoes and plate tectonic movement.
C)Volcanoes cause plate tectonic movement.
D)Plate movement causes rocks to melt into magma.
8.
Which of these describes granitic magma? 1.e
A)high silica, fast moving
B)high silica, slow moving
C)low silica, slow moving
D)low silica, fast moving
9.
_________ is made up of alternating tephra and lava layers. 1.d
A)Cinder cone volcanoes
B)Composite volcanoes
C)Shield volcanoes
D)No volcano
10.
A collapsed volcano fills with water creating a lake. This is an example of a ________. 1.d
A)lava dome
B)lava tube
C)caldera
D)sill
11.
The Hawaiian islands are formed from __________ action. 1.d
A)fault-block
B)folding
C)uplifting
D)volcanic
12.
What kind of lava is most explosive? 1.d
A)lava that is high in iron
B)lava that is low in silica
C)lava that is high in silica
D)lava that is high in magnesium
13.
What causes the broad, gently sloping sides of a shield volcano? 1.d
A)highly viscous lava
B)basaltic lava
C)ocean floor spreading
D)colliding plates
14.
What is tephra? 1.d
A)lava that has cooled in midair after an eruption
B)lava that cools beneath the surface before an eruption
C)very fluid lava
D)lava that is slowly released from fissures
15.
How would you describe lava with a high viscosity? 1.d
A)smooth
B)fluid
C)thick
D)watery
16.
Which of these is not an environmental hazard caused by a volcano? 1.d
A)radiation
B)volcanic ash
C)acid rain
D)lava
17.
Which of these may occur as a warning that a volcanic eruption may soon occur? 2.d
A)no changes in gas emissions
B)many small earthquakes
C)constant low temperatures
D)no changes in the shape of the land
18.
A lahar may be dangerous to people for which of these reasons? 2.d
A)it moves slowly so it is very hot
B)it moves quickly so there is little warning
C)it has water so it produces too much steam
D)it is dry so it burns the landscape
19.
How does volcanic ash compare to ashes from wood? 2.d
A)They are similar, except volcanic ash has sharp particles.
B)They are exactly alike.
C)There is nothing similar about them.
D)They are similar, except wood ash has no grains of material.
20.
Scientists use radar images and GPS to monitor volcanic activity by ___________. 7.b
A)observing constant temperature and land shape
B)observing changes in temperature and land shape
C)observing changes in people's habitats
D)observing constant habitats for people and wildlife
Grade 6
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