Question 1

Why do we know that the geothermal gradient near the surface cannot continue very deeply into Earth?

Accepted Answer

If the geothermal gradient near the surface continued at depth,the temperature at only 100 km depth would be so high that all known rocks would melt despite the high pressure.

Question 2

Seismic waves that cause a rolling or swaying motion of the surface of the ground are called ____________________ waves.

Accepted Answer

surface

Question 3

The temperature range at the base of the crust is:

Accepted Answer

A) 100 to 250°C. 
B) 250 to 550°C. 
C) 500 to 800°C. 
D) 800 to 1,200°C. 
E) 1,000 to 1500°. 
A) 100 to 250°C. 
B) 250 to 550°C. 
C) 500 to 800°C. 
D) 800 to 1,200°C. 
E) 1,000 to 1500°. D

Question 4

What is Earth's average density,what are the average surface rock densities,and what does this tell us about the interior of Earth?

Accepted Answer

Earth's average density is 5.5

Question 5

The composition of the core is:

Accepted Answer

A) peridotite. 
B) basalt. 
C) granite. 
D) iron. 
E) iron and nickel metal. 
A) peridotite. 
B) basalt. 
C) granite. 
D) iron. 
E) iron and nickel metal.

Question 6

The Modified Mercalli Intensity Scale is a subjective scale to measure the destructive effects of an earthquake.

Accepted Answer

A) True 
 B)False

Question 7

Why do most earthquakes occur along the circum-Pacific belt?

Accepted Answer

Convergent plate boundaries line the Pac

Question 8

Benioff zones indicate the angle of plate descent along a convergent plate boundary.

Accepted Answer

A) True 
 B)False

Question 9

Landslides and ground motion are significant sources of danger created by earthquakes.

Accepted Answer

A) True 
 B)False

Question 10

What evidence do scientists use to estimate the density and composition of the core?

Accepted Answer

The composition of the core is

Question 11

Why are all intermediate- to deep-focus earthquakes generated at convergent plate boundaries?

Accepted Answer

The convergent plates generate

Question 12

What is usually the ultimate cause of the stresses and pressures that build up in rocks and produce earthquakes?

Accepted Answer

Plate tect

Question 13

Tsunamis are significant sources of danger created by earthquakes.

Accepted Answer

A) True 
 B)False

Question 14

What happens to P- waves and S-waves when they encounter the core-mantle boundary,and what does this change in behavior indicate about the core?

Accepted Answer

P-wave velocity abruptly decre

Question 15

The fastest seismic waves,which can travel through solids,liquids,and gases,are ____________________ waves.

Accepted Answer

The answer of The fastest seismic waves,which can travel through...

Question 16

The structural layer of Earth that is liquid is the ____________________ ____________________.

Accepted Answer

The answer of The structural layer of Earth that is...

Question 17

All intermediate- to deep-focus earthquakes occur along ____________________ plate boundaries.

Accepted Answer

The answer of All intermediate- to deep-focus earthquakes occur along...

Question 18

The structural layer that comprises the greatest volume of Earth is the ____________________.

Accepted Answer

The answer of The structural layer that comprises the greatest...

Question 19

Monitoring changes in electrical resistance is a scientifically accepted method used to predict earthquakes.

Accepted Answer

A) True 
 B)False

Question 20

The minimum number of seismograph records needed to locate the epicenter of an earthquake is ____________________.

Accepted Answer

The answer of The minimum number of seismograph records needed...

Why do we know that the geothermal gradient near the surface cannot continue very deeply into Earth?

Seismic waves that cause a rolling or swaying motion of the surface of the ground are called ____________________ waves.

The temperature range at the base of the crust is:

What is Earth's average density,what are the average surface rock densities,and what does this tell us about the interior of Earth?

The composition of the core is:

The Modified Mercalli Intensity Scale is a subjective scale to measure the destructive effects of an earthquake.

Why do most earthquakes occur along the circum-Pacific belt?

Benioff zones indicate the angle of plate descent along a convergent plate boundary.

Landslides and ground motion are significant sources of danger created by earthquakes.

What evidence do scientists use to estimate the density and composition of the core?

Why are all intermediate- to deep-focus earthquakes generated at convergent plate boundaries?

What is usually the ultimate cause of the stresses and pressures that build up in rocks and produce earthquakes?

Tsunamis are significant sources of danger created by earthquakes.

What happens to P- waves and S-waves when they encounter the core-mantle boundary,and what does this change in behavior indicate about the core?

The fastest seismic waves,which can travel through solids,liquids,and gases,are ____________________ waves.

The structural layer of Earth that is liquid is the .

All intermediate- to deep-focus earthquakes occur along ____________________ plate boundaries.

The structural layer that comprises the greatest volume of Earth is the ____________________.

Monitoring changes in electrical resistance is a scientifically accepted method used to predict earthquakes.

The minimum number of seismograph records needed to locate the epicenter of an earthquake is ____________________.

Understanding Earth: A Dynamic and Evolving Planet

Plate Tectonics: A Unifying Theory

Minerals: The Building Blocks of Rocks

Igneous Rocks and Intrusive Igneous Activity

Volcanoes and Volcanism

Weathering, Soil, and Sedimentary Rocks

Metamorphism and Metamorphic Rocks

Deformation, Mountain Building, and the Continents

Mass Wasting

Running Water

Groundwater

Glaciers and Glaciation

The Work of Wind and Deserts

Oceans, Shorelines, and Shoreline Processes

Geologic Time: Concepts and Principles

Earth History

Life History

Filters

Exam 8: Earthquakes and Earths Interior

Why do we know that the geothermal gradient near the surface cannot continue very deeply into Earth?

Seismic waves that cause a rolling or swaying motion of the surface of the ground are called ____________________ waves.

The temperature range at the base of the crust is:

What is Earth's average density,what are the average surface rock densities,and what does this tell us about the interior of Earth?

The composition of the core is:

The Modified Mercalli Intensity Scale is a subjective scale to measure the destructive effects of an earthquake.

Why do most earthquakes occur along the circum-Pacific belt?

Benioff zones indicate the angle of plate descent along a convergent plate boundary.

Landslides and ground motion are significant sources of danger created by earthquakes.

What evidence do scientists use to estimate the density and composition of the core?

Why are all intermediate- to deep-focus earthquakes generated at convergent plate boundaries?

What is usually the ultimate cause of the stresses and pressures that build up in rocks and produce earthquakes?

Tsunamis are significant sources of danger created by earthquakes.

What happens to P- waves and S-waves when they encounter the core-mantle boundary,and what does this change in behavior indicate about the core?

The fastest seismic waves,which can travel through solids,liquids,and gases,are ____________________ waves.

The structural layer of Earth that is liquid is the ____________________ ____________________.

All intermediate- to deep-focus earthquakes occur along ____________________ plate boundaries.

The structural layer that comprises the greatest volume of Earth is the ____________________.

Monitoring changes in electrical resistance is a scientifically accepted method used to predict earthquakes.

The minimum number of seismograph records needed to locate the epicenter of an earthquake is ____________________.

Understanding Earth: A Dynamic and Evolving Planet

Plate Tectonics: A Unifying Theory

Minerals: The Building Blocks of Rocks

Igneous Rocks and Intrusive Igneous Activity

Volcanoes and Volcanism

Weathering, Soil, and Sedimentary Rocks

Metamorphism and Metamorphic Rocks

Deformation, Mountain Building, and the Continents

Mass Wasting

Running Water

Groundwater

Glaciers and Glaciation

The Work of Wind and Deserts

Oceans, Shorelines, and Shoreline Processes

Geologic Time: Concepts and Principles

Earth History

Life History

Filters

The structural layer of Earth that is liquid is the .