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WGU D199 PHYSICAL AND HUMAN GEOGRAPHY FINAL
EXAM 2026/2027 | Complete Summary & Exam Guide
| Pass Guaranteed - A+ Graded
Section 1: Physical Geography - Earth Systems & Geomorphology (Q1-15)
Q1. A geologist drills into Earth's interior and passes through the Moho discontinuity
from oceanic crust into the upper mantle. Which statement accurately describes the
composition change observed?
A. The crust and mantle are both solid iron-nickel alloys.
B. The oceanic crust is dense basaltic rock while the mantle below is ultramafic
silicate rock capable of slow flow. [CORRECT]
C. The oceanic crust transitions directly into the liquid outer core.
D. The mantle is composed of solid iron and nickel with no convection.
Rationale: Oceanic crust is thin, dense basaltic rock, while the underlying mantle
consists of ultramafic silicate minerals that behave plastically and convect over
geologic time. Choice A incorrectly describes the core's composition; C skips the
entire mantle; D describes the inner core, not the mantle.
Correct Answer: B
Q2. At a convergent plate boundary where an oceanic plate subducts beneath a
continental plate, which landform is most likely to develop?
A. A mid-ocean ridge with basaltic lava flows
B. A deep oceanic trench and a continental volcanic mountain range [CORRECT]
C. A strike-slip fault valley with horizontal displacement
D. A rift valley with divergent magma upwelling
Rationale: Oceanic-continental convergence produces subduction, creating an
oceanic trench offshore and a volcanic arc or mountain range on the continental
margin (e.g., Andes). Choice A describes divergent boundaries; C describes transform
boundaries; D describes continental rifting.
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Correct Answer: B
Q3. A divergent boundary in the Atlantic Ocean is characterized by seafloor
spreading and symmetrical magnetic striping. Which landform marks this boundary?
A. A subduction zone with deep-focus earthquakes
B. A mid-ocean ridge with basaltic volcanic activity [CORRECT]
C. A transform fault with strike-slip motion
D. A collision zone with folded mountain ranges
Rationale: Divergent boundaries in oceanic crust produce mid-ocean ridges where
magma upwells, cools as basalt, and creates new seafloor with symmetrical magnetic
reversals. Choice A describes convergent boundaries; C describes transform
boundaries; D describes continental collision.
Correct Answer: B
Q4. The San Andreas Fault in California is associated with frequent earthquakes but
no volcanic activity. Which plate boundary type explains this pattern?
A. Convergent boundary with subduction
B. Divergent boundary with seafloor spreading
C. Transform boundary with strike-slip horizontal motion [CORRECT]
D. Passive margin with no plate interaction
Rationale: The San Andreas is a transform boundary where the Pacific and North
American plates slide horizontally past each other, generating earthquakes without
magma generation. Choices A and B involve vertical motion and magma; D describes
inactive margins.
Correct Answer: C
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Q5. During an earthquake, seismographs record the initial rupture point 15 km below
the surface. The point on Earth's surface directly above this rupture is identified as:
A. The focus, which is always deeper than 70 km
B. The epicenter, located directly above the focus [CORRECT]
C. The hypocenter, which is synonymous with the surface location
D. The convergent point, marking plate collision
Rationale: The focus (hypocenter) is the subsurface point where fault rupture initiates;
the epicenter is the surface location directly above it. Choice A confuses focus with
epicenter; C incorrectly defines hypocenter; D introduces an unrelated plate tectonics
concept.
Correct Answer: B
Q6. An earthquake measures 6.0 on the Richter scale. A second earthquake in the
same region measures 7.0. How does the amplitude of seismic waves compare?
A. The 7.0 earthquake has waves with 10 times the amplitude [CORRECT]
B. The 7.0 earthquake has waves with 2 times the amplitude
C. The 7.0 earthquake has waves with 100 times the amplitude
D. Both earthquakes have identical wave amplitudes
Rationale: The Richter scale is logarithmic; each whole number increase represents a
tenfold increase in wave amplitude (and roughly 31.6 times more energy). Choice B
confuses the scale with linear measurement; C describes two whole numbers (100x);
D ignores the logarithmic relationship.
Correct Answer: A
Q7. A volcano in Hawaii produces broad, gently sloping shield-shaped mountains
with fluid basaltic lava flows. Which volcanic type and eruption style is described?
A. Composite stratovolcano with explosive andesitic eruptions
B. Shield volcano with effusive basaltic lava flows [CORRECT]
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C. Cinder cone with pyroclastic ash explosions
D. Caldera with rhyolitic lava domes
Rationale: Hawaiian volcanoes are classic shield volcanoes built by repeated effusion
of low-viscosity basaltic lava that travels long distances. Choice A describes steep,
explosive volcanoes like Mt. St. Helens; C describes small, steep cones of pyroclastic
material; D describes collapse features with viscous lava.
Correct Answer: B
Q8. Mount Rainier in Washington State has steep slopes, a conical shape, and a
history of explosive eruptions producing pyroclastic flows and lahars. Which volcanic
type is this?
A. Shield volcano
B. Cinder cone
C. Composite (stratovolcano) [CORRECT]
D. Fissure vent
Rationale: Composite or stratovolcanoes are steep-sided, conical volcanoes formed
by alternating layers of lava and pyroclastic material, typically with explosive
eruptions of intermediate magma. Choice A describes broad, gentle volcanoes; B
describes small pyroclastic cones; D describes linear lava outpourings.
Correct Answer: C
Q9. A small, steep-sided volcanic cone composed entirely of loose pyroclastic
material and scoria forms in a single eruption event. Which type is this?
A. Shield volcano
B. Composite stratovolcano
C. Cinder cone [CORRECT]
D. Supervolcano
WGU D199 PHYSICAL AND HUMAN GEOGRAPHY FINAL
EXAM 2026/2027 | Complete Summary & Exam Guide
| Pass Guaranteed - A+ Graded
Section 1: Physical Geography - Earth Systems & Geomorphology (Q1-15)
Q1. A geologist drills into Earth's interior and passes through the Moho discontinuity
from oceanic crust into the upper mantle. Which statement accurately describes the
composition change observed?
A. The crust and mantle are both solid iron-nickel alloys.
B. The oceanic crust is dense basaltic rock while the mantle below is ultramafic
silicate rock capable of slow flow. [CORRECT]
C. The oceanic crust transitions directly into the liquid outer core.
D. The mantle is composed of solid iron and nickel with no convection.
Rationale: Oceanic crust is thin, dense basaltic rock, while the underlying mantle
consists of ultramafic silicate minerals that behave plastically and convect over
geologic time. Choice A incorrectly describes the core's composition; C skips the
entire mantle; D describes the inner core, not the mantle.
Correct Answer: B
Q2. At a convergent plate boundary where an oceanic plate subducts beneath a
continental plate, which landform is most likely to develop?
A. A mid-ocean ridge with basaltic lava flows
B. A deep oceanic trench and a continental volcanic mountain range [CORRECT]
C. A strike-slip fault valley with horizontal displacement
D. A rift valley with divergent magma upwelling
Rationale: Oceanic-continental convergence produces subduction, creating an
oceanic trench offshore and a volcanic arc or mountain range on the continental
margin (e.g., Andes). Choice A describes divergent boundaries; C describes transform
boundaries; D describes continental rifting.
,2
Correct Answer: B
Q3. A divergent boundary in the Atlantic Ocean is characterized by seafloor
spreading and symmetrical magnetic striping. Which landform marks this boundary?
A. A subduction zone with deep-focus earthquakes
B. A mid-ocean ridge with basaltic volcanic activity [CORRECT]
C. A transform fault with strike-slip motion
D. A collision zone with folded mountain ranges
Rationale: Divergent boundaries in oceanic crust produce mid-ocean ridges where
magma upwells, cools as basalt, and creates new seafloor with symmetrical magnetic
reversals. Choice A describes convergent boundaries; C describes transform
boundaries; D describes continental collision.
Correct Answer: B
Q4. The San Andreas Fault in California is associated with frequent earthquakes but
no volcanic activity. Which plate boundary type explains this pattern?
A. Convergent boundary with subduction
B. Divergent boundary with seafloor spreading
C. Transform boundary with strike-slip horizontal motion [CORRECT]
D. Passive margin with no plate interaction
Rationale: The San Andreas is a transform boundary where the Pacific and North
American plates slide horizontally past each other, generating earthquakes without
magma generation. Choices A and B involve vertical motion and magma; D describes
inactive margins.
Correct Answer: C
,3
Q5. During an earthquake, seismographs record the initial rupture point 15 km below
the surface. The point on Earth's surface directly above this rupture is identified as:
A. The focus, which is always deeper than 70 km
B. The epicenter, located directly above the focus [CORRECT]
C. The hypocenter, which is synonymous with the surface location
D. The convergent point, marking plate collision
Rationale: The focus (hypocenter) is the subsurface point where fault rupture initiates;
the epicenter is the surface location directly above it. Choice A confuses focus with
epicenter; C incorrectly defines hypocenter; D introduces an unrelated plate tectonics
concept.
Correct Answer: B
Q6. An earthquake measures 6.0 on the Richter scale. A second earthquake in the
same region measures 7.0. How does the amplitude of seismic waves compare?
A. The 7.0 earthquake has waves with 10 times the amplitude [CORRECT]
B. The 7.0 earthquake has waves with 2 times the amplitude
C. The 7.0 earthquake has waves with 100 times the amplitude
D. Both earthquakes have identical wave amplitudes
Rationale: The Richter scale is logarithmic; each whole number increase represents a
tenfold increase in wave amplitude (and roughly 31.6 times more energy). Choice B
confuses the scale with linear measurement; C describes two whole numbers (100x);
D ignores the logarithmic relationship.
Correct Answer: A
Q7. A volcano in Hawaii produces broad, gently sloping shield-shaped mountains
with fluid basaltic lava flows. Which volcanic type and eruption style is described?
A. Composite stratovolcano with explosive andesitic eruptions
B. Shield volcano with effusive basaltic lava flows [CORRECT]
, 4
C. Cinder cone with pyroclastic ash explosions
D. Caldera with rhyolitic lava domes
Rationale: Hawaiian volcanoes are classic shield volcanoes built by repeated effusion
of low-viscosity basaltic lava that travels long distances. Choice A describes steep,
explosive volcanoes like Mt. St. Helens; C describes small, steep cones of pyroclastic
material; D describes collapse features with viscous lava.
Correct Answer: B
Q8. Mount Rainier in Washington State has steep slopes, a conical shape, and a
history of explosive eruptions producing pyroclastic flows and lahars. Which volcanic
type is this?
A. Shield volcano
B. Cinder cone
C. Composite (stratovolcano) [CORRECT]
D. Fissure vent
Rationale: Composite or stratovolcanoes are steep-sided, conical volcanoes formed
by alternating layers of lava and pyroclastic material, typically with explosive
eruptions of intermediate magma. Choice A describes broad, gentle volcanoes; B
describes small pyroclastic cones; D describes linear lava outpourings.
Correct Answer: C
Q9. A small, steep-sided volcanic cone composed entirely of loose pyroclastic
material and scoria forms in a single eruption event. Which type is this?
A. Shield volcano
B. Composite stratovolcano
C. Cinder cone [CORRECT]
D. Supervolcano
