AnswersWCA 4130 Earth and Space Science 1st Quarter 26-27Environmental Changes

Environmental Changes — Unit test Answers

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Which statement describes divergent boundaries?

A
Divergent boundaries are found only on land.
B
Subduction occurs at divergent boundaries.
C
Plates move toward each other at divergent boundaries.
D
Magma flows from cracks in the crust at divergent boundaries.
2
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What is the orientation of the magnetic stripes of iron contained in rocks that support the idea of seafloor spreading?

A
east and west
B
north and east
C
south and west
D
north and south
3

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

A
convergent
B
divergent
C
subduction
D
transform
4

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.
5

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
6

Study this image.

Question illustration
A
Oceanic and continental plates are colliding.
B
Oceanic and continental plates are shifting past each other.
C
Two continental plates are forming a large mountain.
D
Two oceanic plates are creating several island chains.
7

Which effect is one likely result of a forest fire?

A
extinction
B
adaptation
C
speciation
D
forced migration
8

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
9

Study this image of lithospheric plates.

Question illustration
A
Pacific, Eurasian, and African
B
African, North American, and South American
C
Eurasian, African, and South American
D
North American, Pacific, and African
10

Which statement describes the location of an earthquake’s epicenter?

A
It is located using a single set of data.
B
It is determined by the Mercalli Scale.
C
It is determined by the arrival time of surface waves.
D
It is located at the point directly above the focus
11

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.
12

The image shows a volcanic eruption.

Question illustration
A
This eruption is quiet.
B
This eruption is explosive.
C
This eruption was caused by low-viscosity magma.
D
This eruption may set its surroundings on fire.
13

A tsunami hits the coast of a heavily populated island. Which effect might occur?

A
extinction
B
loss of homes
C
genetic change
D
speciation
14

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.
15

What type of stress occurs when plates move apart?

A
compression
B
faulting
C
shearing
D
tension
16

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
17

Which features form along all types of plate boundaries?

A
faults
B
rift valleys
C
mountains
D
ocean ridges
18

From which location does seafloor spreading originate?

A
mid-ocean ridges
B
edges of continents
C
deep-ocean trenches
D
underwater volcanoes
19

Which continents contain folded mountains that match up to form one continuous mountain chain, serving as evidence that they once belonged to one landmass called Pangaea?

A
Antarctica and Africa
B
Africa and North America
C
South America and Africa
D
Eurasia and South America
20

Humans’ use of rocks and minerals as building materials is an example of which interaction?

A
an interaction within the geosphere
B
an interaction within the hydrosphere
C
an interaction between the biosphere and the geosphere
D
an interaction between the biosphere and the atmosphere

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