Focus On Earth Science: California Grade 6

Chapter 7: Volcanoes

Standard Assessment

1.
Which is the best definition of a volcano? 1.d
A)a feature that forms when plate boundaries slide horizontally past each other
B)a feature that forms when collisions between plates pushes the crust upward
C)a feature that forms when magma reaches Earth's surface
D)a feature that form when magma squeezes into cracks below Earth's surface.
2.
Gas emissions from volcanoes can be hazardous because ________ can be formed. 2.d
A)small earthquakes
B)ash clouds
C)a lahar
D)acidic precipitation
3.
The Hawaiian Islands were formed _______. 1.e
A)at a convergent plate boundary
B)at a divergent plate boundary
C)over a hot spot
D)over a mid-ocean ridge
4.
Because magma is less dense than the rocks surrounding it in the mantle, magma _______. 1.d
A)is forced downward
B)is forced upward
C)causes explosive eruptions
D)causes quiet eruptions
5.
Dissolved gases in magma, such as water vapor, tend to cause _______. 1.d
A)explosive eruptions
B)quiet eruptions
C)fissure eruptions
D)shield volcanoes
6.
The Hawaiian Islands are examples of _______. 1.e
A)batholiths
B)composite volcanoes
C)fissure eruptions
D)shield volcanoes
7.
Magma is formed at a _______ when an oceanic plate slides beneath another plate and partially melts. 1.e
A)hot spot
B)divergent plate boundary
C)convergent plate boundary
D)batholith
8.
Explosive eruptions tend to occur if the magma _______. 1.d
A)is basaltic
B)has a low viscosity
C)contains a high percentage of silica
D)contains a low percentage of silica
9.
Fissure eruptions occur at _______. 1.e
A)convergent plate boundaries
B)divergent plate boundaries
C)island arcs
D)ocean trenches
10.
A fast-moving mass of hot gases and solids produced by an explosive eruption is a _______. 2.d
A)lahar
B)lava flow
C)pyroclastic flow
D)lava tube
11.
A _______ forms when an oceanic plate slides under a continental plate. 1.e
A)ocean trench
B)island arc
C)mid-ocean ridge
D)volcanic arc
12.
Which of these is not a type of volcano? 1.d
A)sill
B)cinder cone
C)shield
D)composite
13.
A _______ is the depression formed when the top of a volcano collapses. 1.d
A)caldera
B)dike
C)sill
D)batholith
14.
Volcanic ash from an eruption can bury plants and animals, and _______. 2.d
A)contaminate water supplies
B)form acidic precipitation
C)start fires
D)release smoke
15.
Volcanoes in California are part of a volcanic arc formed where _______. 1.f
A)the Pacific plate subducts beneath the North American plate
B)the Juan de Fuca plate slides horizontally past the North American plate
C)the Pacific plate slides horizontally past the North American plate
D)the Juan de Fuca plate subducts beneath the North American plate
Grade 6
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