AnswersPARTA - EVP PGCPS BIOGEOCHEM CR FALL2026 - 798113Lab: Plate Boundaries and Movement

Lab: Plate Boundaries and Movement — Unit test Answers

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According to the theory of plate tectonics, which is one feature that plates carry?

A
seafloor
B
inner core
C
lower mantle
D
asthenosphere
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

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.
4

Which statement explains what happens to older crust during seafloor spreading?

A
It is destroyed at coastlines.
B
It moves under continents.
C
It is destroyed at a mid-ocean ridge.
D
It moves away from a mid-ocean ridge.
5

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

A
earthquake
B
fault
C
plate
D
stress
6

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.
7

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

A
epicenter
B
focus
C
lithosphere
D
waves
8

Which type of volcanic mountain has wide, gentle slopes?

A
rift
B
shield
C
composite
D
cinder cone
9

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
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

How long ago do scientists believe the continents formed Pangaea?

A
about 135 million years ago
B
about 180 million years ago
C
about 300 million years ago
D
about 4.5 billion years ago
12

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
13

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.
14

Which features form along all types of plate boundaries?

A
faults
B
rift valleys
C
mountains
D
ocean ridges
15

Which coal field location is related to coal fields in the United States and supports the theory of continental drift?

A
India
B
Africa
C
Australia
D
Europe

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