AnswersCentral 25-26 CR SCI 100A FallUnit Test

Unit Test — Unit test Answers

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Which statement describes a difference between the lower mantle and oceanic crust?

A
The lower mantle is closer to Earth’s surface than oceanic crust is.
B
The lower mantle is found closer to sea level than oceanic crust is.
C
The lower mantle experiences more pressure than oceanic crust does.
D
The lower mantle has a more tarry consistency than oceanic crust does.
10
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What is the name of the theory that explains why mountain ranges in Africa and South America line up?

A
Pangaea theory
B
landmass theory
C
continental drift theory
D
plate movement theory
11

What first caused people to consider that the continents were once one large landmass?

A
glacier evidence in warmer countries
B
continents looked like they fit together
C
studying the valleys of the ocean floor
D
similar fossils were found on many continents
12

Which best explains how heat plays a role in the movement of materials within Earth’s interior?

A
Hot material near Earth’s surface is more dense and sinks, and when it cools, it becomes less dense and rises.
B
Hot material near the core is more dense and rises, and when it cools, it becomes less dense and sinks.
C
Hot material near Earth’s surface is less dense and sinks, and when it cools, it becomes more dense and rises.
D
Hot material near the core is less dense and rises, and when it cools, it becomes more dense and sinks.
13

Study the table about Earth’s interior.If silicic rock is found in a core sample, what evidence does this provide about the rock’s location?

Question illustration
A
Its location is likely underneath an ocean or a mountain.
B
Its location is likely denser than Earth’s lithosphere.
C
Its location likely has a consistency that changes from solid to liquid.
D
Its location likely contributes to the creation of Earth’s magnetic field.
14

The hydrosphere refers to the total amount of water on Earth, including liquid, gas, and solid forms. Which is one way the hydrosphere has been impacted by the movement of the continents over time?

A
Glaciers that once covered South Africa have melted and can no longer form.
B
All of the continents have fewer coastal areas than they did millions of years ago.
C
Land masses near the equator have more glaciers now than they did millions of years ago.
D
The poles that were once covered by glaciers are now surrounded by warm, tropical waters.
15

Which object can an S wave travel through?

A
air
B
magma
C
soil
D
water
16

Study the table about Earth’s interior.Which conclusion is supported by information in the table?

Question illustration
A
The mantle is thinner than the crust.
B
The core is the thickest of Earth’s layers.
C
The inner core is thicker than the outer core.
D
The mantle is the thinnest of Earth’s layers.
17

What evidence of climate change on continents supports the theory of continental drift?

A
signs that glaciers existed in South Africa
B
similar coal fields on different continents
C
change in atmospheric temperature over time
D
same animal fossils found on different continents
18

Study the graph about seismic waves.What does the graph show?

Question illustration
A
The S and P waves travel the same distance through Earth’s crust in the same amount of time.
B
The P wave travels through Earth’s crust more quickly than the S wave travels.
C
It takes the P wave 18 minutes to travel 6,000 km through Earth’s crust.
D
It takes the S wave 11 minutes to travel 8,000 km through Earth’s crust.
19

Study the image of a seismic graph.About how far does the S wave travel through Earth in 13 minutes?

Question illustration
A
2,000 km
B
4,000 km
C
6,000 km
D
8,000 km
20

Study the image of Earth’s layers.

Question illustration
A
Earth’s mantle is thinner than its oceanic crust.
B
Earth’s outer core is thicker than its mantle.
C
Earth’s continental crust is thicker than its lithosphere.
D
Earth’s lithosphere is thinner than its asthenosphere.
21

A scientist collects a core sample from 60 km deep in Earth.Which characteristic will she most likely observe in this sample?

A
The sample has high iron content.
B
The sample is very hot and liquefied.
C
The sample mainly consists of granite.
D
The sample is very young.
22

A plate moves south at a rate of 2 cm/year. How many meters south from its original location will the plate be in 4,000 years?

A
8,000 meters south
B
4,000 meters south
C
200 meters south
D
80 meters south
23

Which piece of evidence suggests that Africa and South America formed Gondwanaland 200 million years ago?

A
coal fields
B
a shared ocean
C
folded mountains
D
land formations created by glaciers
24

Which coastlines most closely match each other and are, therefore, used as evidence to support Wegener’s theory?

A
India and Eurasia
B
Australia and Africa
C
Africa and South America
D
Australia and North America
25

Why is Earth's outer core hotter than Earth’s oceanic crust?

A
Earth’s oceanic crust is denser than Earth’s outer core is.
B
Earth’s oceanic crust has lava flowing from the mantle.
C
Earth’s outer core has a composition of solid iron and nickel.
D
Earth’s outer core is deeper within Earth than oceanic crust is.

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