Indiana Science Grade 8

Chapter 14: Volcanoes

Volcanoes

1.
Cinder cone volcanic eruptions are ___________.
A)gradual and pour tephra over the edges
B)slow and occur over long periods of time
C)explosive and throw lava high into the air
D)gradual and pour lava over the edges, which collects in pools
2.
Intrusive igneous rock bodies such as batholiths and sills form when __________.
A)lava solidifies on Earth's surface
B)an earthquake occurs
C)a volcano erupts
D)magma solidifies underground
3.
Magma originates in which layer of Earth?
A)inner core
B)mantle
C)core
D)crust
4.
Shield volcanoes are the result of __________.
A)basaltic and andesitic lava flows
B)basaltic lava flows
C)andesitic lava flows
D)granitic lava flows
5.
A pyroclastic flow is__________.
A)an opening in the side of a volcano
B)a type of lava flow
C)hot volcanic ash and debris that rushes down the side of a volcano
D)another form of precipitation
6.
What two factors control the explosiveness of an eruption?
A)the pressure within Earth and plate movement
B)the amount of water vapor and silica in the magma
C)the time of year and current weather conditions
D)the amount of gases and pressure within Earth's crust
7.
Convergent plate boundaries __________.
A)don't produce volcanoes
B)force one plate beneath Earth's surface
C)create volcanoes that are not as violent as others
D)spread apart Earth's surface
8.
A volcano is an opening in Earth that erupts__________.
A)gases
B)all answers are correct
C)ash
D)lava
9.
What are batholiths?
A)magma bodies that cool slowly before they reach Earth's surface
B)hot magma flows that cool slowly before they reach Earth's surface
C)magma bodies that cool quickly before they reach Earth's surface
D)hot magma flows that cool quickly before they reach Earth's surface
10.
Islands like Iceland are often formed due to __________.
A)all answers are correct
B)cooling lava flows
C)plate movement
D)rifts in the Earth's surface
11.
High levels of silica causes magma to become __________.
A)more fluid
B)thicker
C)less dense
D)thinner
12.
What is the difference between lava and magma?
A)They originate from different places.
B)After magma reaches the surface it's called lava.
C)They are different colors.
D)They are made of different types of rock.
13.
Of the three types of volcanoes, which is the least explosive?
A)cinder volcanoes
B)They all have the same level of explosiveness.
C)composite volcanoes
D)shield volcanoes
14.
Intrusive igneous rocks are those which __________.
A)are composed of sediments found in flood beds
B)changed over time from one type of rock to another
C)cool on Earth's surface
D)cool beneath Earth's surface
15.
What is a vent?
A)a small fissure on the side of a volcano
B)the opening in a volcano
C)the steep depression around a volcano's opening
D)the remains of an eroded volcano
16.
Sulfurous gases emitted by volcanoes __________.
A)are contained totally within lava flows
B)are good for the environment
C)can mix with water vapor and form acid rain
D)help plants grow
17.
The Hawaiian Islands are formed because of __________.
A)converging plates
B)diverging plates
C)hot spots
D)subduction
18.
A volcanic neck is the remains of a(n) ___________.
A)eroded volcano
B)active volcano
C)intrusive igneous rock
D)magma flow
19.
Volcanoes often are found in areas on Earth where __________.
A)mountains are found
B)plates collide
C)plates fit together perfectly
D)rivers are found
20.
The difference between basaltic and granitic magma is __________.
A)the amount of water vapor
B)the way it cools
C)the color
D)the amount of silica
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