Earth Science
EARTH SYSTEMS SCIENCE FINAL
DETAILED COMPLIED SET EXAM 2025
What is an earthquake? Under what circumstances do most large earthquakes occur?
Explain why and how earthquakes occur, according to the elastic rebound hypothesis.
Why is there an upper limit on the intensity of earthquakes? - -An earthquake is a
sudden shaking of the ground, caused by the movement of tectonic plates or the
release of stress in the Earth's crust. Most large earthquakes occur along faults,
especially at plate boundaries, like subduction zones, transform faults, and rifting zones.
The elastic rebound hypothesis explains earthquakes by suggesting that stress builds
up in the crust due to plate movement. When the stress exceeds the strength of the
rocks, they rupture and release energy as seismic waves. Afterward, the rocks "snap
back" to their original shape.
There's an upper limit to earthquake intensity because of the strength of rocks and the
size of faults. Once the stress exceeds the rock's strength, it ruptures, and there's a
physical limit to how much stress can accumulate before this happens.
What is the relationship between an earthquake's focus and its epicenter? - -The focus
is the point inside Earth where an earthquake starts, and the epicenter is the point on
the surface directly above it.
How are faults, hypocenters, and epicenters related? - -A fault is a fracture where rocks
move, the hypocenter is the point inside Earth where an earthquake starts, and the
epicenter is directly above it on the surface.
How are seismic waves recorded and measured? What is the difference between a
seismograph and a seismogram? Describe the principle of a seismograph. - -A
seismograph detects ground motion, and a seismogram is the recorded wave pattern. It
works on the principle of inertia, where a stationary mass moves relative to the ground.
How do scientists use seismic waves to determine the location of an earthquake?
Describe the process. - -P-waves (faster) and S-waves (slower) reaching seismographs
to calculate the distance to the earthquake.
What type of faults tend to produce the most destructive earthquakes? - -Reverse faults
and thrust faults, common at convergent boundaries, tend to produce the most
destructive earthquakes due to the large amounts of energy released.
Describe the important features of the Richter magnitude scale, the seismic moment
magnitude scale, and the modified Mercalli intensity scale, and comment on the
differences between them. - -The Richter scale measures magnitude based on seismic
wave amplitude, suited for small quakes. The seismic moment magnitude scale
Earth Science
,Earth Science
measures total energy released, for all quake sizes. The Modified Mercalli scale
assesses earthquake effects on people and structures.
What are reflection and refraction, and how do they help scientists determine what's
insterm-6ide Earth? - -Reflection occurs when seismic waves bounce off boundaries,
and refraction happens when they bend as they pass through different materials.
How did Earth acquire its layered structure? - -Earth's layered structure formed during
its early molten state, when denser materials sank to form the core, and lighter
materials rose to form the mantle and crust through a process called differentiation.
Briefly describe how seismic waves are used to probe Earth's interior - -Seismic waves
change speed and direction based on the materials they pass through. By analyzing
their reflection and refraction, scientists can map Earth's layers and determine their
composition.
How do continental crustal and oceanic crust differ? - -Continental crust is thicker, less
dense, and made mostly of granite, while oceanic crust is thinner, denser, and primarily
composed of basalt.
Contrast the physical makeup of the asthenosphere and the lithosphere - -The
lithosphere is rigid, brittle, and includes the Earth's crust and uppermost mantle. The
asthenosphere is softer, more ductile, and located beneath the lithosphere, allowing it to
flow slowly.
How are Earth's inner and outer cores different? How are they similar? - -The inner core
is solid, made of iron and nickel, due to high pressure, while the outer core is liquid, also
composed of iron and nickel, because of lower pressure. Both are at Earth's center.
Earthquakes can cause damage in many ways; name and briefly describe four or more.
- -Shaking: Damages buildings.
Surface Rupture: Cracks the ground.
Liquefaction: Buildings sink.
Tsunamis: Coastal flooding.
Landslides: Triggered by shaking.
Can scientists predict when and where earthquakes will occur? How can scientists
forecast earthquakes? - -Scientists cannot predict exact times or locations of
earthquakes. However, they can forecast earthquake likelihood based on fault zones,
historical data, and seismic activity patterns.
List the major differences between P. S. and surface waves - -P-waves: Fastest, travel
through solids and liquids, compressional motion.
S-waves: Slower, travel only through solids, shear motion.
Surface waves: Slowest, travel along Earth's surface, cause most damage.
Earth Science
, Earth Science
How have scientists used earthquakes to determine the dimensions of tectonic plates
and the characteristics of tectonic processes such as subduction? - -Scientists use
earthquake data to map plate boundaries, study seismic wave patterns, and identify
subduction zones, revealing tectonic processes like plate movement and convergence.
What affects the velocities of seismic waves? - -Seismic wave velocities are affected by
material composition, density, and temperature. Waves travel faster through denser,
more rigid materials and slower through less dense or more fluid ones.
Which type of seismic waves tend to cause the greatest destruction to buildings? - -
Surface waves tend to cause the greatest destruction to buildings due to their slower
speed and larger amplitude, leading to stronger ground motion.
What information does a travel-time graph provide? - -A travel-time graph shows the
time it takes for seismic waves to travel different distances, helping scientists determine
the location of an earthquake's epicenter and the properties of Earth's interior.
Briefly describe the triangulation method used to determine the epicenter of an
earthquake. - -The triangulation method uses data from at least three seismograph
stations. By measuring the time difference between P- and S-waves, the distance to the
epicenter is calculated. The epicenter is located where the three distance circles
intersect.
How much more energy does a magnitude 7.0 earthquake release than a 6.0
earthquake? - -A magnitude 7.0 earthquake releases about 32 times more energy than
a magnitude 6.0 earthquake, as the energy increases by a factor of roughly 32 for each
whole number on the Richter scale.
Why is the moment magnitude scale favored over the Richter scale? - -The moment
magnitude scale is preferred because it accurately measures large earthquakes and
accounts for total energy, fault size, and movement, unlike the Richter scale, which is
less precise for big quakes.
Where does the greatest amount of seismic activity occur? - -Ring of Fire, a zone of
tectonic plate boundaries around the Pacific Ocean, where most earthquakes and
volcanic eruptions happen.
What type of plate boundary is associated with Earth's largest earthquakes? - -
Convergent plate boundaries are associated with Earth's largest earthquakes,
especially in subduction zones, where one plate is forced beneath another.
What is the difference between magma and lava? What is the difference between
pyroclasts and tephra? - -Magma is molten rock beneath Earth's surface, while lava is
magma that has erupted onto the surface.
Pyroclasts are fragments of volcanic material ejected during an eruption, while tephra
refers to all airborne volcanic material, including pyroclasts.
Earth Science
EARTH SYSTEMS SCIENCE FINAL
DETAILED COMPLIED SET EXAM 2025
What is an earthquake? Under what circumstances do most large earthquakes occur?
Explain why and how earthquakes occur, according to the elastic rebound hypothesis.
Why is there an upper limit on the intensity of earthquakes? - -An earthquake is a
sudden shaking of the ground, caused by the movement of tectonic plates or the
release of stress in the Earth's crust. Most large earthquakes occur along faults,
especially at plate boundaries, like subduction zones, transform faults, and rifting zones.
The elastic rebound hypothesis explains earthquakes by suggesting that stress builds
up in the crust due to plate movement. When the stress exceeds the strength of the
rocks, they rupture and release energy as seismic waves. Afterward, the rocks "snap
back" to their original shape.
There's an upper limit to earthquake intensity because of the strength of rocks and the
size of faults. Once the stress exceeds the rock's strength, it ruptures, and there's a
physical limit to how much stress can accumulate before this happens.
What is the relationship between an earthquake's focus and its epicenter? - -The focus
is the point inside Earth where an earthquake starts, and the epicenter is the point on
the surface directly above it.
How are faults, hypocenters, and epicenters related? - -A fault is a fracture where rocks
move, the hypocenter is the point inside Earth where an earthquake starts, and the
epicenter is directly above it on the surface.
How are seismic waves recorded and measured? What is the difference between a
seismograph and a seismogram? Describe the principle of a seismograph. - -A
seismograph detects ground motion, and a seismogram is the recorded wave pattern. It
works on the principle of inertia, where a stationary mass moves relative to the ground.
How do scientists use seismic waves to determine the location of an earthquake?
Describe the process. - -P-waves (faster) and S-waves (slower) reaching seismographs
to calculate the distance to the earthquake.
What type of faults tend to produce the most destructive earthquakes? - -Reverse faults
and thrust faults, common at convergent boundaries, tend to produce the most
destructive earthquakes due to the large amounts of energy released.
Describe the important features of the Richter magnitude scale, the seismic moment
magnitude scale, and the modified Mercalli intensity scale, and comment on the
differences between them. - -The Richter scale measures magnitude based on seismic
wave amplitude, suited for small quakes. The seismic moment magnitude scale
Earth Science
,Earth Science
measures total energy released, for all quake sizes. The Modified Mercalli scale
assesses earthquake effects on people and structures.
What are reflection and refraction, and how do they help scientists determine what's
insterm-6ide Earth? - -Reflection occurs when seismic waves bounce off boundaries,
and refraction happens when they bend as they pass through different materials.
How did Earth acquire its layered structure? - -Earth's layered structure formed during
its early molten state, when denser materials sank to form the core, and lighter
materials rose to form the mantle and crust through a process called differentiation.
Briefly describe how seismic waves are used to probe Earth's interior - -Seismic waves
change speed and direction based on the materials they pass through. By analyzing
their reflection and refraction, scientists can map Earth's layers and determine their
composition.
How do continental crustal and oceanic crust differ? - -Continental crust is thicker, less
dense, and made mostly of granite, while oceanic crust is thinner, denser, and primarily
composed of basalt.
Contrast the physical makeup of the asthenosphere and the lithosphere - -The
lithosphere is rigid, brittle, and includes the Earth's crust and uppermost mantle. The
asthenosphere is softer, more ductile, and located beneath the lithosphere, allowing it to
flow slowly.
How are Earth's inner and outer cores different? How are they similar? - -The inner core
is solid, made of iron and nickel, due to high pressure, while the outer core is liquid, also
composed of iron and nickel, because of lower pressure. Both are at Earth's center.
Earthquakes can cause damage in many ways; name and briefly describe four or more.
- -Shaking: Damages buildings.
Surface Rupture: Cracks the ground.
Liquefaction: Buildings sink.
Tsunamis: Coastal flooding.
Landslides: Triggered by shaking.
Can scientists predict when and where earthquakes will occur? How can scientists
forecast earthquakes? - -Scientists cannot predict exact times or locations of
earthquakes. However, they can forecast earthquake likelihood based on fault zones,
historical data, and seismic activity patterns.
List the major differences between P. S. and surface waves - -P-waves: Fastest, travel
through solids and liquids, compressional motion.
S-waves: Slower, travel only through solids, shear motion.
Surface waves: Slowest, travel along Earth's surface, cause most damage.
Earth Science
, Earth Science
How have scientists used earthquakes to determine the dimensions of tectonic plates
and the characteristics of tectonic processes such as subduction? - -Scientists use
earthquake data to map plate boundaries, study seismic wave patterns, and identify
subduction zones, revealing tectonic processes like plate movement and convergence.
What affects the velocities of seismic waves? - -Seismic wave velocities are affected by
material composition, density, and temperature. Waves travel faster through denser,
more rigid materials and slower through less dense or more fluid ones.
Which type of seismic waves tend to cause the greatest destruction to buildings? - -
Surface waves tend to cause the greatest destruction to buildings due to their slower
speed and larger amplitude, leading to stronger ground motion.
What information does a travel-time graph provide? - -A travel-time graph shows the
time it takes for seismic waves to travel different distances, helping scientists determine
the location of an earthquake's epicenter and the properties of Earth's interior.
Briefly describe the triangulation method used to determine the epicenter of an
earthquake. - -The triangulation method uses data from at least three seismograph
stations. By measuring the time difference between P- and S-waves, the distance to the
epicenter is calculated. The epicenter is located where the three distance circles
intersect.
How much more energy does a magnitude 7.0 earthquake release than a 6.0
earthquake? - -A magnitude 7.0 earthquake releases about 32 times more energy than
a magnitude 6.0 earthquake, as the energy increases by a factor of roughly 32 for each
whole number on the Richter scale.
Why is the moment magnitude scale favored over the Richter scale? - -The moment
magnitude scale is preferred because it accurately measures large earthquakes and
accounts for total energy, fault size, and movement, unlike the Richter scale, which is
less precise for big quakes.
Where does the greatest amount of seismic activity occur? - -Ring of Fire, a zone of
tectonic plate boundaries around the Pacific Ocean, where most earthquakes and
volcanic eruptions happen.
What type of plate boundary is associated with Earth's largest earthquakes? - -
Convergent plate boundaries are associated with Earth's largest earthquakes,
especially in subduction zones, where one plate is forced beneath another.
What is the difference between magma and lava? What is the difference between
pyroclasts and tephra? - -Magma is molten rock beneath Earth's surface, while lava is
magma that has erupted onto the surface.
Pyroclasts are fragments of volcanic material ejected during an eruption, while tephra
refers to all airborne volcanic material, including pyroclasts.
Earth Science
