LSU GEOL 1001 EXAM Questions
with Answers Updated Pass
Guaranteed | Verified Questions
LSU GEOL 1001 EXAM Questions with Answers | Comprehensive
Examination
LSU GEOL 1001 EXAM Questions with Answers Updated
Pass Guaranteed actual exam preparation document with
verified questions, complete answers, and focused rationales
INTRODUCTION
This document is an important and very helpful preparation
resource for LSU GEOL 1001 EXAM Questions with Answers
Updated Pass Guaranteed. Every item uses a focused exam
stem, four response options, a keyed response, and a clear
rationale, making it easier to understand the subject, spot
distractors, and build real exam confidence.
Page 1
, Question 1
A felsic magma with high dissolved HO and high viscosity erupts from a
continental volcanic arc. Which eruption style and resulting deposit are most
consistent with these magma properties?
A. Effusive eruption producing extensive basaltic lava plateaus
B. Explosive eruption producing pyroclastic flows and welded tuff
C. Fissure eruption producing pillow basalts
D. Submarine eruption producing black smokers
Correct Answer: B - Explosive eruption producing pyroclastic
flows and welded tuff
RATIONALE
High viscosity and high dissolved volatiles in felsic magma impede
gas escape, leading to violent explosive eruptions that generate
pyroclastic flows and welded tuffs. Effusive basaltic eruptions, pillow
basalts, and black smokers are associated with low-viscosity mafic
magmas, so A, C, and D are incorrect.
Question 2
A clastic sedimentary rock contains abundant quartz grains, well-rounded,
well-sorted, with silica cement. Which depositional environment and maturity
level does this best indicate?
A. Glacial till; immature
B. Alluvial fan; submature
C. Beach/coastal dune; supermature
D. Deep-marine turbidite; immature
Correct Answer: C - Beach/coastal dune; supermature
Page 2
, RATIONALE
Well-rounded, well-sorted quartz arenite indicates extensive transport
and winnowing, typical of high-energy beach or dune settings,
reflecting supermature texture. Glacial till and turbidites are poorly
sorted and immature; alluvial fans are typically submature with more
lithic fragments.
Question 3
At a transform boundary, which seismic and structural feature is most
characteristic?
A. Deep-focus earthquakes along a Wadati-Benioff zone
B. Shallow-focus earthquakes and strike-slip faulting
C. Extensive andesitic volcanism
D. Normal faulting and crustal extension
Correct Answer: B - Shallow-focus earthquakes and strike-slip
faulting
RATIONALE
Transform boundaries are dominated by strike-slip faulting and
shallow-focus earthquakes due to lateral shearing of the lithosphere.
Wadati-Benioff zones, andesitic volcanism, and normal faulting are
associated with subduction and divergent boundaries, respectively.
Question 4
Which mineral property best distinguishes calcite from quartz in a hand
specimen?
A. Calcite has perfect rhombohedral cleavage and reacts with dilute HCl;
quartz has conchoidal fracture and no reaction.
B. Calcite is harder than quartz and scratches glass.
C. Quartz has perfect cubic cleavage and effervesces in acid.
D. Both have the same hardness and cleavage, differing only in color.
Page 3
, Correct Answer: A - Calcite has perfect rhombohedral cleavage
and reacts with dilute HCl; quartz has conchoidal fracture and no
reaction.
RATIONALE
Calcite (CaCO) exhibits perfect rhombohedral cleavage and
effervesces in dilute hydrochloric acid, while quartz (SiO) has no
cleavage (conchoidal fracture) and is inert to acid. Hardness and
cleavage differences clearly separate the two; options B, C, and D
misstate these diagnostic properties.
Question 5
A radioactive isotope has a half-life of 100 million years. If a mineral grain
contains 25% parent isotope and 75% daughter product, what is its
approximate age?
A. 50 million years
B. 100 million years
C. 200 million years
D. 300 million years
Correct Answer: C - 200 million years
RATIONALE
After one half-life, 50% parent remains; after two half-lives, 25%
parent remains. Since two half-lives have elapsed, the age is 2 × 100 =
200 million years. Options A, B, and D do not match the exponential
decay relationship.
Question 6
Which combination of rock types would most likely be found in a region that
experienced regional metamorphism followed by intrusion of a granitic pluton?
A. Shale, slate, phyllite, schist, gneiss, granite
B. Basalt, gabbro, peridotite, komatiite
Page 4
with Answers Updated Pass
Guaranteed | Verified Questions
LSU GEOL 1001 EXAM Questions with Answers | Comprehensive
Examination
LSU GEOL 1001 EXAM Questions with Answers Updated
Pass Guaranteed actual exam preparation document with
verified questions, complete answers, and focused rationales
INTRODUCTION
This document is an important and very helpful preparation
resource for LSU GEOL 1001 EXAM Questions with Answers
Updated Pass Guaranteed. Every item uses a focused exam
stem, four response options, a keyed response, and a clear
rationale, making it easier to understand the subject, spot
distractors, and build real exam confidence.
Page 1
, Question 1
A felsic magma with high dissolved HO and high viscosity erupts from a
continental volcanic arc. Which eruption style and resulting deposit are most
consistent with these magma properties?
A. Effusive eruption producing extensive basaltic lava plateaus
B. Explosive eruption producing pyroclastic flows and welded tuff
C. Fissure eruption producing pillow basalts
D. Submarine eruption producing black smokers
Correct Answer: B - Explosive eruption producing pyroclastic
flows and welded tuff
RATIONALE
High viscosity and high dissolved volatiles in felsic magma impede
gas escape, leading to violent explosive eruptions that generate
pyroclastic flows and welded tuffs. Effusive basaltic eruptions, pillow
basalts, and black smokers are associated with low-viscosity mafic
magmas, so A, C, and D are incorrect.
Question 2
A clastic sedimentary rock contains abundant quartz grains, well-rounded,
well-sorted, with silica cement. Which depositional environment and maturity
level does this best indicate?
A. Glacial till; immature
B. Alluvial fan; submature
C. Beach/coastal dune; supermature
D. Deep-marine turbidite; immature
Correct Answer: C - Beach/coastal dune; supermature
Page 2
, RATIONALE
Well-rounded, well-sorted quartz arenite indicates extensive transport
and winnowing, typical of high-energy beach or dune settings,
reflecting supermature texture. Glacial till and turbidites are poorly
sorted and immature; alluvial fans are typically submature with more
lithic fragments.
Question 3
At a transform boundary, which seismic and structural feature is most
characteristic?
A. Deep-focus earthquakes along a Wadati-Benioff zone
B. Shallow-focus earthquakes and strike-slip faulting
C. Extensive andesitic volcanism
D. Normal faulting and crustal extension
Correct Answer: B - Shallow-focus earthquakes and strike-slip
faulting
RATIONALE
Transform boundaries are dominated by strike-slip faulting and
shallow-focus earthquakes due to lateral shearing of the lithosphere.
Wadati-Benioff zones, andesitic volcanism, and normal faulting are
associated with subduction and divergent boundaries, respectively.
Question 4
Which mineral property best distinguishes calcite from quartz in a hand
specimen?
A. Calcite has perfect rhombohedral cleavage and reacts with dilute HCl;
quartz has conchoidal fracture and no reaction.
B. Calcite is harder than quartz and scratches glass.
C. Quartz has perfect cubic cleavage and effervesces in acid.
D. Both have the same hardness and cleavage, differing only in color.
Page 3
, Correct Answer: A - Calcite has perfect rhombohedral cleavage
and reacts with dilute HCl; quartz has conchoidal fracture and no
reaction.
RATIONALE
Calcite (CaCO) exhibits perfect rhombohedral cleavage and
effervesces in dilute hydrochloric acid, while quartz (SiO) has no
cleavage (conchoidal fracture) and is inert to acid. Hardness and
cleavage differences clearly separate the two; options B, C, and D
misstate these diagnostic properties.
Question 5
A radioactive isotope has a half-life of 100 million years. If a mineral grain
contains 25% parent isotope and 75% daughter product, what is its
approximate age?
A. 50 million years
B. 100 million years
C. 200 million years
D. 300 million years
Correct Answer: C - 200 million years
RATIONALE
After one half-life, 50% parent remains; after two half-lives, 25%
parent remains. Since two half-lives have elapsed, the age is 2 × 100 =
200 million years. Options A, B, and D do not match the exponential
decay relationship.
Question 6
Which combination of rock types would most likely be found in a region that
experienced regional metamorphism followed by intrusion of a granitic pluton?
A. Shale, slate, phyllite, schist, gneiss, granite
B. Basalt, gabbro, peridotite, komatiite
Page 4
