6.3: Questions

Question 1 What is the primary cause of ground shaking during an earthquake?
Sudden movement of a block of rock slipping past another along faults
Gradual movement of the Earth's crust
Volcanic eruptions
Weather patterns

Question 2 What describes the location on Earth's surface directly above the point where the rock slippage begins?
Epicenter
Hypocenter
Fault line
Seismic zone

Question 3 What is the main reason for the shaking that occurs during an earthquake?
The energy carried by seismic waves causes the material to vibrate
The movement of tectonic plates in the Earth's crust
The release of heat from the Earth's core
The collapse of underground caverns

Question 4 How do seismic waves behave as they move away from the source of an earthquake?
They maintain their energy and speed consistently
They change direction and speed randomly
They dissipate rapidly but maintain their direction
They increase in energy and speed as they travel

Question 5 What is the primary result of compressional forces at convergent plate boundaries where one continent is colliding with another?
The formation of numerous large thrust faults
The creation of deep-sea trenches
The production of volcanic arcs
The generation of mid-ocean ridges

Question 6 At what rate is the Indian-Australian plate advancing into the Eurasian plate, resulting in the uplift of the Himalayas?
4.5 centimeters per year
1.5 centimeters per year
9.5 centimeters per year
6.5 centimeters per year

Question 7 What type of faults are characterized by horizontal displacement parallel to the fault trace, often found at transform plate boundaries?
Strike-slip faults
Normal faults
Reverse faults
Dip-slip faults

Question 8 What is a notable example of a large transform fault that accommodates horizontal motion between two tectonic plates?
San Andreas Fault
Rocky Mountain Fault
Grand Teton Fault
Appalachian Fault

Question 9 What is a common feature of large transform faults, such as the San Andreas Fault, in terms of their geometry?
They are perfectly straight and continuous
They consist of numerous branches and smaller fractures
They only have one main branch with no smaller fractures
They are always perpendicular to the direction of plate motion

Question 10 How do modern seismographs differ from ancient Chinese instruments?
They are similar in principle, but with modern technology
They use a different type of weight and support system
They are only used to measure surface waves
They are no longer used to determine the direction of earthquake waves

Question 11 What type of information can be obtained from seismograms?
The nature of seismic waves and the types of waves generated
The exact location of the earthquake epicenter
The magnitude of the earthquake and its impact on the environment
The depth of the earthquake and its effect on tectonic plates

Question 12 What are the two main types of seismic waves in an earthquake?
Body waves and surface waves
Primary waves and secondary waves
Push/pull waves and stretch/compress waves
Tectonic waves and geological waves

Question 13 Where do surface waves travel in relation to Earth's surface?
In the rock layers just below Earth's surface
Through Earth's interior, like body waves
Along the Earth's surface, without penetrating the ground
In the atmosphere, above the Earth's surface

Question 14 What are the two types of body waves?
Primary waves (P waves) and secondary waves (S waves)
Push/pull waves and stretch/compress waves, by their frequency
Fast waves and slow waves, by their speed
Long waves and short waves, by their wavelength

Question 15 How do P waves, or primary waves, travel through rocks?
They compress and stretch in the direction of the wave's travel
They travel around the rocks, without interacting with them
They only compress rocks, without stretching them
They only stretch rocks, without compressing them

Question 16 How do S waves, or secondary waves, travel through rocks?
They oscillates left and right (or up and down) relative to the direction of the wave's travel
They travel around the rocks, without interacting with them
They only compress rocks, without stretching them
They only stretch rocks, without compressing them

Question 17 How do P and S waves differ in travel speed?
P waves travel faster than S waves
S waves travel faster than P waves
They travel at the same speed
Neither P waves nor S waves travel at a predictable speed

Question 18 Why are seismographs securely attached to bedrock?
To provide a stable support for the weight and ensure accurate measurements
To protect the seismograph from damage during an earthquake
To allow the seismograph to move freely and detect seismic waves
To connect the seismograph to other instruments and share data

Question 19 What type of scale do magnitude scales use to accommodate the wide variation in earthquake strength?
Logarithmic scale
Linear scale
Angular scale
Geometric scale

Question 20 If an earthquake has a magnitude of 6, how much greater is the amplitude of ground shaking compared to an earthquake with a magnitude of 5?
10 times greater
5 times greater
20 times greater
2 times greater

Question 21 According to the logarithmic scale used in magnitude scales, what increase in wave amplitude corresponds to an increase of 1 on the magnitude scale?
10-fold increase
5-fold increase
2-fold increase
20-fold increase

Question 22 What is the primary mechanism that generates most tsunamis?
Displacement along a thrust fault under sea
Volcanic eruptions under the ocean
Meteorite impacts in the ocean
Storms with high winds and large waves

Question 23 How do the speeds of tsunami waves change as they move from deep water to coastal waters?
They slow down and grow in height
They speed up and decrease in height
They remain constant in speed and height
They first speed up, then slow down

Question 24 What is the approximate speed of a tsunami wave in deep water?
800 kilometers per hour
50 kilometers per hour
500 kilometers per hour
1000 kilometers per hour

Question 25 What is the primary cause of rock deformation?
Tectonic forces
Weathering and erosion
Plate cooling and solidification
Volcanic activity

Question 26 Where does rock deformation mostly occur?
Along plate boundaries
At the Earth's core
In the atmosphere
On the ocean floor

Question 27 What term do geologists use to describe the structural features that reflect a rock's tectonic history?
Tectonic structures
Geologic formations
Rock layers
Plate boundaries

Question 28 What type of tectonic structure involves the reshaping of rock layers without breakage?
Folds
Faults
Joints
Fractures

Question 29 What is the result of compressional forces at depth?
Folds in the rock layers
Fractures in the rock layers
Uplift of the rock layers
Rotation of the rock layers

Question 30 What are the three types of tectonic structures?
Folds, faults, and joints
Folds, fractures, and faults
Joints, fractures, and plate boundaries
Geologic formations, rock layers, and tectonic structures

Question 31 What type of stress occurs when a force is applied equally in all directions to a rock body?
Compressional stress
Tensional stress
Shear stress
Confining pressure

Question 32 Which type of plate boundary is most often associated with compressional stress?
Convergent plate boundary
Divergent plate boundary
Transform plate boundary
Continental plate boundary

Question 33 What is the result of compressional stress on the Earth's crust over millions of years?
The formation of mountain belts
The creation of oceanic trenches
The formation of volcanoes
The thinning of the Earth's crust

Question 34 What type of stress pulls apart rock bodies, resulting in stretching and lengthening?
Tensional stress
Compressional stress
Shear stress
Confining pressure

Question 35 At which type of plate boundary do tensional stresses typically occur?
Divergent plate boundary
Convergent plate boundary
Transform plate boundary
Continental plate boundary

Question 36 What type of stress is responsible for the movement of one part of a rock body past another?
Shear stress
Compressional stress
Tensional stress
Confining pressure

Question 37 Which plate boundary is characterized by the horizontal slipping of large segments of the Earth's crust past one another?
Transform plate boundary
Convergent plate boundary
Divergent plate boundary
Continental plate boundary

Question 38 What is the effect of differential stress on rock bodies, as opposed to confining pressure?
Differential stress causes deformation (directed growth), while confining pressure compacts mineral grains
Differential stress compacts mineral grains, while confining pressure causes deformation
Differential stress and confining pressure have the same effect on rock bodies
Differential stress and confining pressure are the same type of stress

Question 39 How does the Earth's crust typically respond to compressional stress at convergent plate boundaries?
It is shortened horizontally and thickened vertically
It is lengthened horizontally and thinned vertically
It remains unchanged
It is stretched and fractured

Question 40 What is the term used to describe a change in shape caused by stress in a rock body?
Strain
Stress
Deformation
Elasticity

Question 41 What happens to a rock that exhibits brittle deformation when its strength is surpassed?
It breaks into smaller pieces
It changes shape without breaking
It returns to its original shape
It becomes more elastic

Question 42 What is an example of a material that exhibits ductile deformation?
Plastic
Glass
Wood
Metal

Question 43 What is the primary mechanism by which ductile deformation occurs in rocks?
Slippage along surfaces of weakness and gradual reshaping of mineral grains
Breaking of chemical bonds
Elastic deformation
Fracturing

Question 44 What is the result of differential stress on a rock body?
Strain
Stress
Deformation
Fracture

Question 45 Which type of deformation is characterized by a temporary change in shape that is reversed when the stress is removed?
Elastic deformation
Brittle deformation
Ductile deformation
Permanent deformation

Question 46 What is an example of an object that exhibits brittle deformation when its strength is surpassed?
A drinking glass
A piece of clay
A metal spring
A rubber band

Question 47 What is the difference between elastic and brittle deformation?
Elastic deformation is temporary, while brittle deformation is permanent
Elastic deformation is permanent, while brittle deformation is temporary
Elastic deformation occurs in rocks, while brittle deformation occurs in minerals
Elastic deformation occurs in minerals, while brittle deformation occurs in rocks

Question 48 How does ductile deformation in rocks allow them to change shape?
Through slippage along surfaces of weakness and gradual reshaping of mineral grains
Through breaking of chemical bonds
Through elastic deformation
Through fracturing

Question 49 What can be inferred by observing and measuring the strain imprinted on a rock body?
The type of stress that deformed the rock
The type of rock that was deformed
The amount of time it took for the rock to deform
The direction of the stress that deformed the rock

Question 50 Which of the following is a characteristic of ductile deformation in rocks?
It occurs slowly over time
It results in the rock breaking into smaller pieces
It is a temporary change in shape
It occurs through the breaking of chemical bonds

Question 51 What is the primary cause of fold formation in sedimentary strata along convergent plate boundaries?
Compressional forces
Tensional forces
Shear forces
Volcanic activity

Question 52 Which of the following types of folds is characterized by arching of sedimentary layers?
Anticline
Syncline
Monocline
Dike

Question 53 What is the term for the trough that is often found in association with an anticline?
Syncline
Anticline
Fold axis
Limb

Question 54 What is the relationship between the limbs of an anticline and a syncline?
The limb of an anticline is also a limb of the adjacent syncline
The limb of an anticline is never a limb of the adjacent syncline
The limbs of an anticline and syncline always intersect
The limbs of an anticline and syncline are always parallel

Question 55 What is the result of compressional forces on the Earth's crust in terms of fold formation?
Shortening and thickening of the crust
Lengthening and thinning of the crust
No change in the crust's dimensions
Random deformation of the crust

Question 56 What is the term used to describe a broad upwarp in basement rock that deforms the overlying cover of sedimentary strata and generates a large, circular or elongated fold?
Dome
Basin
Monocline
Fault

Question 57 Which of the following is an example of a large domed structure generated by upwarping?
The Black Hills of South Dakota
The basin of Michigan
The Colorado Plateau
The basin of Illinois

Question 58 What is the characteristic shape of the beds in a large basin, such as that in Illinois?
Very gently sloping
Steeply sloping
Horizontal landscape
Irregular terrains

Question 59 In a large basin, where are the youngest rocks typically found?
Near the center
At the flanks
At the surface
At the base

Question 60 What is the term used to describe a large, step-like fold in otherwise horizontal sedimentary strata, such as those found in the Colorado Plateau?
Monocline
Dome
Basin
Fault

Question 61 What is the process that causes the formation of monoclines?
Reactivation of ancient, steep-dipping faults located in basement rocks
Erosion of sedimentary strata
Deposition of new sedimentary layers
Volcanic activity

Question 62 How do sedimentary strata respond to the displacement of large blocks of basement rock upward, such as in the formation of monoclines?
They drape over the fault like clothes hanging over a bench
They are pushed downward, forming a basin
They are broken and faulted
They remain unchanged

Question 63 In a domed structure, such as the Black Hills, where are the oldest rocks typically found?
At the core
At the flanks
At the surface
At the base

Question 64 What is the primary result of brittle deformation in rock material?
Faulting of the rock
Folding of the rock layers
Metamorphism of the rock
Weathering of the rock surface

Question 65 What is the term used to describe fractures in the crust where significant displacement has occurred?
Faults
Joints
Folds
Fracture zones

Question 66 How do large faults, such as the San Andreas Fault, typically differ from small faults?
They consist of many interconnecting fault surfaces
They consist of a single discrete break
They only occur in sedimentary rocks
They only occur in igneous rocks

Question 67 What is the term used to describe the rock block immediately above a fault surface?
Hanging wall block
Footwall block
Fault block
Displaced block

Question 68 What type of fault occurs when the hanging wall block moves down relative to the footwall block, resulting in the stretching of the Earth's crust?
Normal fault
Reverse fault
Strike-slip fault
Thrust fault

Question 69 Which of the following statements is true about normal faults?
They accommodate horizontal shortening of the crust
They are only found in small sizes
They have relatively steep dips that tend to flatten out with depth
They result from strong compressional stresses

Question 70 What is the primary difference between a reverse fault and a normal fault?
The direction of movement of the hanging wall block
The size of the fault
The angle of dip
The location of the fault

Question 71 What type of fault has a low angle of dip, allowing the overlying block to slide over the top of the underlying block?
Thrust fault
Normal fault
Reverse fault
Strike-slip fault

Question 72 In which type of environment do normal faults typically occur?
Compressional environment
Tensional environment
Transform environment
Convergent environment

Question 73 What is the result of large-scale movement along thrust faults in mountainous regions?
Older strata are pushed below younger rocks
Older strata end up overlying younger rocks
The Earth's crust is stretched
The Earth's crust is shortened

Question 74 What type of fault has a dominant displacement that is horizontal and parallel to the strike of the fault surface?
Strike-slip fault
Normal fault
Reverse fault
Thrust fault

Question 75 What is the relationship between the hanging wall block and the footwall block in a reverse fault?
The hanging wall block moves down relative to the footwall block
The hanging wall block moves up relative to the footwall block
The hanging wall block does not move relative to the footwall block
The footwall block moves up relative to the hanging wall block