ASBOG FUNDAMENTALS OF GEOLOGY (FG) EXAM |
ALL QUESTIONS AND ANSWERS | A+ GRADED |
COMPREHENSIVE EXAM GUIDE 2026/2027
1. Which mineral property is most directly responsible for the ability of a mineral to resist
being scratched?
A. Cleavage
B. Hardness
C. Specific gravity
D. Luster
Answer: B
Rationale: Hardness measures a mineral's resistance to scratching and is commonly evaluated
using the Mohs hardness scale.
2. A geologist identifies a rock composed primarily of interlocking quartz and feldspar
crystals with no obvious foliation. Which rock is most likely being examined?
A. Granite
B. Slate
C. Schist
D. Phyllite
Answer: A
Rationale: Granite is a coarse-grained, nonfoliated intrusive igneous rock dominated by
quartz and feldspar.
3. Which process is primarily responsible for converting loose sediment into a sedimentary
rock?
A. Partial melting
B. Metamorphic recrystallization
C. Lithification
D. Magmatic differentiation
Answer: C
Rationale: Lithification converts sediment into rock through compaction and cementation,
commonly during burial.
4. A basaltic lava flow cools rapidly at Earth's surface. Which texture should a geologist
expect?
A. Pegmatitic
,B. Coarse-grained
C. Porphyroblastic
D. Fine-grained
Answer: D
Rationale: Rapid cooling at or near the surface limits crystal growth, producing the fine-
grained texture characteristic of basalt.
5. Which mineral is most likely to exhibit two directions of cleavage intersecting at
approximately 90 degrees?
A. Quartz
B. Calcite
C. Pyroxene
D. Mica
Answer: C
Rationale: Pyroxenes characteristically exhibit two cleavage directions at nearly 90 degrees,
whereas amphiboles typically show cleavage at approximately 60 and 120 degrees.
6. A limestone contains abundant shell fragments that have been cemented together. What
type of sedimentary rock is represented?
A. Bioclastic limestone
B. Chert
C. Arkose
D. Evaporite
Answer: A
Rationale: Limestone composed substantially of biologically derived skeletal or shell material
is classified as bioclastic limestone.
7. Which tectonic setting is most commonly associated with the formation of a volcanic
island arc?
A. Continental rifting
B. Oceanic-oceanic subduction
C. Transform faulting
D. Continental collision
Answer: B
Rationale: Subduction of one oceanic plate beneath another can generate magma and
produce a curved chain of volcanic islands.
,8. A geologist observes that a sedimentary bed contains larger clasts at its base and
progressively finer sediment upward. What depositional feature is most likely present?
A. Mud cracks
B. Cross-bedding
C. Graded bedding
D. Ripple marks
Answer: C
Rationale: Graded bedding consists of a systematic vertical change in grain size, commonly
becoming finer upward after rapidly deposited sediment settles from suspension.
9. Which process most directly produces a metamorphic aureole around an intrusive
igneous body?
A. Regional burial
B. Contact metamorphism
C. Cataclastic deformation
D. Hydrothermal weathering
Answer: B
Rationale: Heat released from a magma intrusion alters the surrounding country rock,
producing a zone of contact metamorphism called a metamorphic aureole.
10. Which mineral is generally the most resistant to chemical weathering under surface
conditions?
A. Quartz
B. Olivine
C. Pyroxene
D. Calcic plagioclase
Answer: A
Rationale: Quartz is highly resistant to chemical weathering and commonly survives transport
to become concentrated in mature clastic sediments.
11. A topographic map shows contour lines that form a V shape pointing upstream across a
stream valley. What does the V generally indicate?
A. A ridge extending downstream
B. A fault trace
C. A depression
D. The upstream direction of the valley
Answer: D
, Rationale: Contour lines crossing a stream valley typically form V shapes that point toward
higher elevation, which is generally upstream.
12. Two contour lines on a topographic map are very close together. What does this
indicate?
A. Low relief
B. A steep slope
C. A broad floodplain
D. A drainage divide
Answer: B
Rationale: Closely spaced contour lines indicate a rapid change in elevation over a short
horizontal distance and therefore a steep slope.
13. Which structural feature is characterized by rock layers dipping away from the fold
axis in opposite directions?
A. Anticline
B. Syncline
C. Monocline
D. Overturned fault
Answer: A
Rationale: In a typical anticline, beds dip away from the fold axis, whereas beds in a syncline
dip toward the axis.
14. A fault has a vertical component of displacement in which the hanging wall moves
downward relative to the footwall. What type of fault is this?
A. Reverse fault
B. Thrust fault
C. Normal fault
D. Strike-slip fault
Answer: C
Rationale: In a normal fault, the hanging wall moves downward relative to the footwall,
commonly reflecting extensional tectonic conditions.
15. Which observation provides the strongest evidence that a fault has experienced strike-
slip motion?
A. Offset of a stream channel horizontally
B. Vertical displacement of a marker bed
C. Thickening of sediment above the fault
D. Development of a metamorphic aureole
ALL QUESTIONS AND ANSWERS | A+ GRADED |
COMPREHENSIVE EXAM GUIDE 2026/2027
1. Which mineral property is most directly responsible for the ability of a mineral to resist
being scratched?
A. Cleavage
B. Hardness
C. Specific gravity
D. Luster
Answer: B
Rationale: Hardness measures a mineral's resistance to scratching and is commonly evaluated
using the Mohs hardness scale.
2. A geologist identifies a rock composed primarily of interlocking quartz and feldspar
crystals with no obvious foliation. Which rock is most likely being examined?
A. Granite
B. Slate
C. Schist
D. Phyllite
Answer: A
Rationale: Granite is a coarse-grained, nonfoliated intrusive igneous rock dominated by
quartz and feldspar.
3. Which process is primarily responsible for converting loose sediment into a sedimentary
rock?
A. Partial melting
B. Metamorphic recrystallization
C. Lithification
D. Magmatic differentiation
Answer: C
Rationale: Lithification converts sediment into rock through compaction and cementation,
commonly during burial.
4. A basaltic lava flow cools rapidly at Earth's surface. Which texture should a geologist
expect?
A. Pegmatitic
,B. Coarse-grained
C. Porphyroblastic
D. Fine-grained
Answer: D
Rationale: Rapid cooling at or near the surface limits crystal growth, producing the fine-
grained texture characteristic of basalt.
5. Which mineral is most likely to exhibit two directions of cleavage intersecting at
approximately 90 degrees?
A. Quartz
B. Calcite
C. Pyroxene
D. Mica
Answer: C
Rationale: Pyroxenes characteristically exhibit two cleavage directions at nearly 90 degrees,
whereas amphiboles typically show cleavage at approximately 60 and 120 degrees.
6. A limestone contains abundant shell fragments that have been cemented together. What
type of sedimentary rock is represented?
A. Bioclastic limestone
B. Chert
C. Arkose
D. Evaporite
Answer: A
Rationale: Limestone composed substantially of biologically derived skeletal or shell material
is classified as bioclastic limestone.
7. Which tectonic setting is most commonly associated with the formation of a volcanic
island arc?
A. Continental rifting
B. Oceanic-oceanic subduction
C. Transform faulting
D. Continental collision
Answer: B
Rationale: Subduction of one oceanic plate beneath another can generate magma and
produce a curved chain of volcanic islands.
,8. A geologist observes that a sedimentary bed contains larger clasts at its base and
progressively finer sediment upward. What depositional feature is most likely present?
A. Mud cracks
B. Cross-bedding
C. Graded bedding
D. Ripple marks
Answer: C
Rationale: Graded bedding consists of a systematic vertical change in grain size, commonly
becoming finer upward after rapidly deposited sediment settles from suspension.
9. Which process most directly produces a metamorphic aureole around an intrusive
igneous body?
A. Regional burial
B. Contact metamorphism
C. Cataclastic deformation
D. Hydrothermal weathering
Answer: B
Rationale: Heat released from a magma intrusion alters the surrounding country rock,
producing a zone of contact metamorphism called a metamorphic aureole.
10. Which mineral is generally the most resistant to chemical weathering under surface
conditions?
A. Quartz
B. Olivine
C. Pyroxene
D. Calcic plagioclase
Answer: A
Rationale: Quartz is highly resistant to chemical weathering and commonly survives transport
to become concentrated in mature clastic sediments.
11. A topographic map shows contour lines that form a V shape pointing upstream across a
stream valley. What does the V generally indicate?
A. A ridge extending downstream
B. A fault trace
C. A depression
D. The upstream direction of the valley
Answer: D
, Rationale: Contour lines crossing a stream valley typically form V shapes that point toward
higher elevation, which is generally upstream.
12. Two contour lines on a topographic map are very close together. What does this
indicate?
A. Low relief
B. A steep slope
C. A broad floodplain
D. A drainage divide
Answer: B
Rationale: Closely spaced contour lines indicate a rapid change in elevation over a short
horizontal distance and therefore a steep slope.
13. Which structural feature is characterized by rock layers dipping away from the fold
axis in opposite directions?
A. Anticline
B. Syncline
C. Monocline
D. Overturned fault
Answer: A
Rationale: In a typical anticline, beds dip away from the fold axis, whereas beds in a syncline
dip toward the axis.
14. A fault has a vertical component of displacement in which the hanging wall moves
downward relative to the footwall. What type of fault is this?
A. Reverse fault
B. Thrust fault
C. Normal fault
D. Strike-slip fault
Answer: C
Rationale: In a normal fault, the hanging wall moves downward relative to the footwall,
commonly reflecting extensional tectonic conditions.
15. Which observation provides the strongest evidence that a fault has experienced strike-
slip motion?
A. Offset of a stream channel horizontally
B. Vertical displacement of a marker bed
C. Thickening of sediment above the fault
D. Development of a metamorphic aureole
