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Volcanoes — Unit test Answers

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1
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Which example is indirect evidence used to study Earth’s interior?

A
composition of minerals in a rock
B
age of a rock from within Earth
C
location of an earthquake’s epicenter
D
texture of different core samples
2
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Where does compression often occur?

A
along a normal fault
B
along a strike-slip fault
C
at a divergent boundary
D
at a convergent boundary
3

Which word identifies the shaking that results from movement under Earth’s surface?

A
earthquake
B
fault
C
plate
D
stress
4

Why do scientists study seismographs?

A
to learn about different rock samples
B
to determine the location of an epicenter
C
to analyze mineral content from Earth’s crust
D
to observe temperature changes on Earth’s surface
5

Which word identifies the agent that carries the energy released from earthquakes?

A
epicenter
B
focus
C
lithosphere
D
waves
6

Which statement best explains why Earth’s outer core is in liquid form?

A
The iron-nickel alloy melts due to hot temperatures.
B
The outer core has a tarry consistency.
C
This region is less dense when compared to the mantle.
D
This region is under extreme pressure from the weight of other layers.
7

What happened to the giant landmass that Wegener described?

A
The pieces remained the same shape over time.
B
The pieces moved quickly to their current locations.
C
The pieces moved toward one another and created mountains.
D
The pieces broke apart and drifted away from one another over time.
8

Which phrase best describes igneous rocks?

A
form when lava and magma cool
B
accumulate sediments following erosion
C
require heat and pressure to be formed
D
consist of many sediment layers
9

Which features form along all types of plate boundaries?

A
faults
B
rift valleys
C
mountains
D
ocean ridges
10

From which location does seafloor spreading originate?

A
mid-ocean ridges
B
edges of continents
C
deep-ocean trenches
D
underwater volcanoes
11

The image shows a type of fault.

Question illustration
A
compression
B
gravity
C
tension
D
shearing
12

Which type of zone is located at a deep-ocean trench?

A
convergent
B
divergent
C
subduction
D
transform
13

The table shows the thickness, top density, and bottom density of the different layers of the Earth. Thickness (km)Density (g/cm3)Types of Rock FoundTopBottomCrust302.22.9Silicic rocksUpper mantle7203.44.4PeridotiteLower mantle2,1714.45.6Magnesium and silicon oxidesOuter core2,2599.912.2Iron+oxygenInner core1,22112.813.1Iron+oxygen

A
As depth increases, the density of the layers increases.
B
As depth increases, the density of the layers decreases.
C
As depth increases, the thickness of the layers increases.
D
As depth increases, the thickness of the layers decreases.
14

What type of stress occurs when plates move apart?

A
compression
B
faulting
C
shearing
D
tension
15

Study the image of this rock.

Question illustration
A
jagged
B
oval
C
round
D
smooth

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