Focus On Earth Science: California Grade 6

Lesson 2: Volcanic Eruptions and Features

Standards Check

1.
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
2.
Which of these is not a type of volcano? 1.d
A)composite
B)cinder cone
C)shield
D)sill
3.
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
4.
A _______ is the depression formed when the top of a volcano collapses. 1.d
A)batholith
B)dike
C)sill
D)caldera
5.
Fissure eruptions occur at _______. 1.e
A)island arcs
B)convergent plate boundaries
C)divergent plate boundaries
D)ocean trenches
6.
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
7.
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
8.
The Hawaiian Islands are examples of _______. 1.e
A)fissure eruptions
B)composite volcanoes
C)shield volcanoes
D)batholiths
9.
Volcanoes in California are part of a volcanic arc formed where _______. 1.f
A)the Juan de Fuca 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 Pacific plate subducts beneath the North American plate
10.
A fast-moving mass of hot gases and solids produced by an explosive eruption is a _______. 2.d
A)lava tube
B)lava flow
C)lahar
D)pyroclastic flow
Grade 6
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