Inside Earth Test Chapter Review Answers. Reviewing Key Terms 1. The relatively soft layer of the...

Inside Earth TestChapter Review Answers

Reviewing Key Terms

1. The relatively soft layer of the upper mantle is the A. Asthenosphere B. Lithosphere C. Inner core D. Continental crust

Reviewing Key Terms

4. The process that powers plate tectonics is A. Radiation B. Convection C. Conduction D. Subduction

Reviewing Key Terms

5. Two plates collide with each other at A. A divergent boundary B. A convergent boundary C. The boundary between the mantle and the crust D. A transform boundary

Reviewing Key Terms

6. Continental crust is made of rocks such as granite.

Reviewing Key Terms

6. Continental crust is made of rocks such as granite. True

Reviewing Key Terms

10. When two continental plates diverge, a transform boundary forms.

Reviewing Key Terms

10. When two continental plates diverge, a transform boundary forms. Rift valley

Checking Concepts

11. What kinds of indirect evidence do geologists use to study the structure of Earth?

Checking Concepts

11. What kinds of indirect evidence do geologists use to study the structure of Earth? Geologists study rocks from Earth's mantle and

deep crust and the speeds and directions of seismic waves.

Checking Concepts

12. How do temperature and pressure change as you go deeper into Earth?

Checking Concepts

12. How do temperature and pressure change as you go deeper into Earth? They both increase

Thinking Critically

17. How are oceanic and continental crust alike? How do they differ?

Thinking Critically

17. How are oceanic and continental crust alike? How do they differ? Both continental crust and oceanic crust are parts

of Earth's outer layer. Continental crust consists mainly of less dense rocks such as granite, whereas oceanic crust consists mainly of denser rock such as basalt. Oceanic crust is denser than continental crust.

Thinking Critically

18. Place these terms in correct order so they begin at Earth's surface and move toward the center: inner core, asthenosphere, lower mantle, lithosphere, outer core.

Thinking Critically

18. Place these terms in correct order so they begin at Earth's surface and move toward the center: inner core, asthenosphere, lower mantle, lithosphere, outer core. Lithosphere, asthenosphere, lower mantle, outer

core, inner core

Thinking Critically

19. In the diagram, a plate of oceanic crust is colliding with a plate of continental crust. What will happen next? Why?

Thinking Critically

19. In the diagram, a plate of oceanic crust is colliding with a plate of continental crust. What will happen next? Why? A subduction zone

forms. The oceanic crust is more dense and therefore slides under the continental crust.

Applying Skills

23. In what direction is the part of the plate carrying Australia moving? In what direction is the part carrying India moving?

Applying Skills

23. In what direction is the part of the plate carrying Australia moving? In what direction is the part carrying India moving? The part carrying

Australia is moving to the northeast. The part carrying India is moving to the north.

Applying Skills

24. As India and Australia move in different directions, what type of plate boundary will form between them?

Applying Skills

24. As India and Australia move in different directions, what type of plate boundary will form between them? Because the plates

are moving in different directions, a divergent boundary will form between them.

Applying Skills

25. What features could occur when the northern part of the Indo-Australian plate is colliding with the Eurasian plate?

Applying Skills

25. What features could occur when the northern part of the Indo-Australian plate is colliding with the Eurasian plate?

This is a convergent plate boundary where two plates made of continental crust are colliding. When the plates converge, the collision squeezes the crust into mountain ranges.

Reviewing Key Terms

1. The force that causes part of the crust to become shorter and thicker is A. Tension B. Compression C. Shearing D. Normal Force

Reviewing Key Terms

2. When the hanging wall of a fault slips down with respect to the footwall, the result is A. Reverse fault B. Syncline C. Normal Fault D. Strike-Slip Fault

Reviewing Key Terms

3. Which of the following is a rating of earthquake damage at a particular location? A. Moment magnitude scale B. Focus scale C. Mercalli scale D. Richter scale

Reviewing Key Terms

4. The largest waves on a seismogram are A. P waves B. S waves C. Surface waves D. Tsunamis

Reviewing Key Terms

7. Rock uplifted by normal faults creates fault-block mountains.

Reviewing Key Terms

7. Rock uplifted by normal faults creates fault-block mountains. True

Reviewing Key Terms

8. An earthquake's epicenter is located deep underground.

Reviewing Key Terms

8. An earthquake's epicenter is located deep underground. Focus

Reviewing Key Terms

9. As S waves move through the ground, they cause it to compress and then expand.

Reviewing Key Terms

9. As S waves move through the ground, they cause it to compress and then expand. P Waves

Reviewing Key Terms

10. Tsunamis are triggered by earthquakes originating beneath the ocean floor.

Reviewing Key Terms

10. Tsunamis are triggered by earthquakes originating beneath the ocean floor. True

Checking Concepts

11. What process causes stress in Earth's crust?

Checking Concepts

11. What process causes stress in Earth's crust? Stress causes changes in the crust's volume or

shape through compression, tension, and shearing.

Checking Concepts

12. Explain how a fault-block mountain forms.

Checking Concepts

12. Explain how a fault-block mountain forms. Where two plates move away from each other,

tension forces may create normal faults. When two normal faults form parallel to each other, a block of rock is left lying between them. As the hanging wall of each normal fault slips downward, the block in between moves upward, forming a fault-block mountain.

Checking Concepts

13. What type of stress in the crust results in the formation of folded mountains? Explain.

Checking Concepts

13. What type of stress in the crust results in the formation of folded mountains? Explain. Compression forms folded mountains.

Compression shortens and thickens the crust so that it bends slowly without breaking. If the fold bends upward into an arch, the fold is called an anticline. If the fold bends downward to form a bowl, the fold is called a syncline.

Checking Concepts

14. What are plateaus and how do they form?

Checking Concepts

14. What are plateaus and how do they form? A plateau is a large area of flat land that is elevated

high above sea level. A plateau may form when vertical faults push up a large, flat block of rock.

Checking Concepts

15. Describe what happens along a fault beneath Earth's surface when an earthquake occurs?

Checking Concepts

15. Describe what happens along a fault beneath Earth's surface when an earthquake occurs?

– An earthquake occurs when rock along a fault suddenly breaks at a point beneath the surface called the focus. This break releases the stress stored in the rock as seismic waves. The seismic waves travel outward from the focus in all directions. They reach the surface at the epicenter.

Thinking Critically

19. Look at the diagram. Describe how the hanging wall moves in relation to the footwall. What kind of fault is this?

Thinking Critically

19. Look at the diagram. Describe how the hanging wall moves in relation to the footwall. What kind of fault is this?

-The hanging wall moves upward in relation to the footwall. It is a reverse fault.

Thinking Critically

20. A geologist has data about an earthquake from two seismographic stations. Is this enough information to determine the location of the epicenter? Why or why not?

Thinking Critically

20. A geologist has data about an earthquake from two seismographic stations. Is this enough information to determine the location of the epicenter? Why or why not?

No, this is not enough information because two circles will show two intersecting points. A third circle is needed to pinpoint one location.

Thinking Critically

21. A community has just built a street across a strike-slip fault that has frequent earthquakes. How will movement along the fault affect the street?

Thinking Critically

21. A community has just built a street across a strike-slip fault that has frequent earthquakes. How will movement along the fault affect the street?

The street will break where it crosses the fault, and the two sides will be moved horizontally in opposite directions.

Thinking Critically

22. How can filled land and loose, soft soil affect the amount of damage caused by an earthquake?

Thinking Critically

22. How can filled land and loose, soft soil affect the amount of damage caused by an earthquake?

In general, filled land and loose, soft soil increase the amount of damage caused by an earthquake. During an earthquake, the loosely packed soil of the filled land shakes more violently than the surrounding rock.

Applying Skills

23. In what order did the seismic waves arrive at the seismograph station?

Applying Skills

23. In what order did the seismic waves arrive at the seismograph station?

-P waves arrive first, then S waves, and finally surface waves

Applying Skills

24. Which type of seismic wave produced the largest ground movement?

Applying Skills

24. Which type of seismic wave produced the largest ground movement?

-Surface waves produce the largest ground movement

Applying Skills

25. What was the difference in arrival times for the P waves and S waves?

Applying Skills

25. What was the difference in arrival times for the P waves and S waves?

-The difference in arrival times was approximately 1 minute and 50 seconds

Applying Skills

26. What would the seismogram look like several hours after this earthquake? How would it change if an aftershock occurred?

Applying Skills

26. What would the seismogram look like several hours after this earthquake? How would it change if an aftershock occurred?

-The up-and-down spikes of the waves would be much less jagged, perhaps creating almost a straight line. If an aftershock occurred, the spikes would resume.

Standardized Test Prep

1. Stress will build until an earthquake occurs if friction along a fault is

A. Decreasing

B. High

C. Low

D. Changed to heat


2. To estimate the total energy released by an earthquake, a geologist should use the

F. Mercalli scale

G. Richter scale

H. Epicenter

J. Moment magnitude scale


3. In the diagram, the epicenter is located at point

A. Q

B. P

C. R

D. S


4. When an earthquake occurs, seismic waves travel

F. From P in all directions

G. From R to S

H. From S in all directions

J. From Q to P


5. At point R, seismic waves from an earthquake would be

A. Weaker than at P

B. Likely to cause little damage

C. Weaker than at Q

D. Likely to cause the most damage


6. Explain the process that forms a strike-slip fault and leads to an earthquake along the fault. In your answer, discuss the force that causes stress in Earth's crust, the type of stress that produces a strike-slip fault, the characteristics of a strike-slip fault, and what happens before and during the earthquake.


6. Explain the process that forms a strike-slip fault and leads to an earthquake along the fault. In your answer, discuss the force that causes stress in Earth's crust, the type of stress that produces a strike-slip fault, the characteristics of a strike-slip fault, and what happens before and during the earthquake.Strike-slip faults occur at points where plates slide past each other

sideways. The movement is caused by stress that builds up in Earth's crust from plate movements. Strike-slip faults are caused by shearing stress that builds up. When enough stress builds up, the rock breaks and the plates slide quickly past each other, causing an earthquake.

Reviewing Key Terms

1. Volcanoes found where two oceanic plates collide form a(n)

A. Cinder cone

B. Island arc

C. Hot spot

D. Ring of Fire

Reviewing Key Terms

2. Magma becomes lava when it reaches a volcano's

A. Geyser

B. Magma chamber

C. Pipe

D. Vent

Reviewing Key Terms

3. Lava that forms smooth, ropelike coils when it hardens is called

A. Aa

B. Silica

C. Pahoehoe

D. Pyroclastic flow

Reviewing Key Terms

4. A volcanic mountain made up of volcanic ash, cinders, and bombs is called a

A. Shield volcano

B. Cinder cone

C. Composite volcano

D. Caldera

Reviewing Key Terms

5. The collapse of a volcano's magma chamber may produce a(n)

A. Crater

B. Island arc

C. Caldera

D. Batholith

Reviewing Key Terms

6. Lava that cuts across rock layers hardens to form a feature called a

A. Dike

B. Caldera

C. Volcanic Neck

D. Sill

Reviewing Key Terms

7. When magma heats underground water, the result may be a

A. Lava flow

B. Vent

C. Hot spot

D. Hot spring

Checking Concepts

8. What is the Ring of Fire?

Checking Concepts

8. What is the Ring of Fire?

The Ring of Fire is a volcanic belt formed by volcanoes that rim the Pacific Ocean.

Checking Concepts

9. What process causes volcanoes to form along the mid-ocean ridge?

Checking Concepts

9. What process causes volcanoes to form along the mid-ocean ridge?

The mid-ocean ridge marks a diverging plate boundary, and lava erupts from cracks in the ocean floor.

Checking Concepts

10. What are two ways volcanoes can form near converging plate boundaries?

Checking Concepts

10. What are two ways volcanoes can form near converging plate boundaries?

An oceanic plate can sink beneath another oceanic plate, or an oceanic plate can sink beneath a continental plate.

Checking Concepts

11. What effect does temperature have on the characteristic of magma?

Checking Concepts

11. What effect does temperature have on the characteristic of magma?

As temperature increases, the viscosity of magma decreases, so the magma flows more easily.

Checking Concepts

12. How does a shield volcano form?

Checking Concepts

12. How does a shield volcano form?

A shield volcano forms when lava repeatedly flows out of a fissure (crack in the ground) and cools to form layers. A gently sloping mountain gradually forms.

Checking Concepts

13. Describe the three stages in the “life cycle” of a volcano.

Checking Concepts

13. Describe the three stages in the “life cycle” of a volcano.

An active volcano is one that has erupted in the recent past and that is likely to erupt in the near future.

A dormant volcano is one that is currently inactive but someday become active again.

An extinct, or dead, volcano is unlikely to erupt again.

Checking Concepts

14. Why can earthquakes be a warning sign that an eruption is about to happen?

Checking Concepts

14. Why can earthquakes be a warning sign that an eruption is about to happen?

Many small earthquakes can occur in the area around a volcano before it erupts. These quakes are triggered by movement of magma into the magma chamber and through the pipe.

Checking Concepts

15. How do hot springs form?

Checking Concepts

15. How do hot springs form?

Hot springs form when water heated by magma or hot rock rises to the surface. A geyser forms when hot water and steam suddenly erupt from a fracture in the rock.

Applying Skills

21. What is this volcano made of? How do geologists classify a volcano made of these materials?

Applying Skills

21. What is this volcano made of? How do geologists classify a volcano made of these materials?

This volcano is made of ash and lava. Geologists classify it as a composite volcano.

Applying Skills

22. What is the feature labeled A in the diagram? What is the feature labeled B? How do these features form?

Applying Skills

22. What is the feature labeled A in the diagram? What is the feature labeled B? How do these features form?

A is a sill. B is a dike. A sill forms when magma moves between rock layers and cools. A dike forms when magma forces its way across rock layers and cools.

Applying Skills

23. What is the feature labeled C in the diagram? If this feature becomes plugged with hardened magma, what could happen to the volcano? Explain.

Applying Skills

23. What is the feature labeled C in the diagram? If this feature becomes plugged with hardened magma, what could happen to the volcano? Explain.

C is a volcanic pipe. If additional magma enters the volcano, an explosive eruption might occur.

Applying Skills

24. What is the feature labeled D in the diagram? What can you infer about this feature if the volcano becomes dormant?

Applying Skills

24. What is the feature labeled D in the diagram? What can you infer about this feature if the volcano becomes dormant?

D is magma chamber. If the volcano becomes dormant, the magma chamber must be empty.


1. A composite volcano is most likely to form

A. Above a hot spot

B. Where an oceanic plate collides with a continental plate

C. Along a mid-ocean ridge

D. Along a rift valley


3. Which step in a volcanic eruption occurs just before the volcano erupts?

A. Magma collects in the magma chamber

B. Lava hardens to form volcanic rock

C. Expanding gases push magma through the pipe

D. The roof of the empty magma chamber collapses


4. Magma that hardens between layers of rock forms a

F. Volcanic neck

G. Dike

H. Batholith

J. Sill


5. The diagram shows the formation of what volcanic feature?

A. Caldera

B. Island arc volcano

C. Hot spot

D. Mid-Ocean Ridge

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