Geology 100 Exam #3 Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: Partial melting of asthenosphere and pooling of basaltic magma under crust →
stack less dense
Answer:
material locally → UPLIFT
Q: Emplacement of intermediate-felsic plutons, growth of volcanoes → stack less
dense material
Answer:
locally → UPLIFT
Q: exotic terranes
Answer:
Exotic terranes = fragments of crust found on margins of larger continents
with differ rocks types and characteristics than other rocks of similar age on
continent
,Geology 100 Exam #3 Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: Cordillera-type Orogeny: tectonic setting; exotic terranes; style of deformation
Answer:
→
Transported to continent by tectonic processes
Terranes are relatively thin pieces of continental crust (e.g., microcontinents or
volcanic island
arcs)
During collision the terranes are added to or accrete to the larger, more stable
continent
Q: Shear stress is conducted to relatively weak sedimentary strata blanketing the
continent
Answer:
→ "Thin-skin" tectonic deformation that extends into continent interior
Deformation propagates into interior from edge like a snow shovel pushing snow
, Geology 100 Exam #3 Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: abyssal plain
Answer:
1) Cooling and subsidence of oceanic
lithosphere
(isostasy!)
2) Deposition of pelagic sediment
Q: Fault-block mountains: extension; role of asthenosphere, basin and range
landscape
Answer:
Hypothesized that shallowly- subducting oceanic plate "detached" when its spreading
center approached the subduction zone
Falling of the cold, dense lithosphere in mantle strengthened convection in mantle
→ Localized upwelling of hot mantle under North America
→ Rift-like extension in southwestern United States and northern Mexico
Latest 2026 Update
Q: Partial melting of asthenosphere and pooling of basaltic magma under crust →
stack less dense
Answer:
material locally → UPLIFT
Q: Emplacement of intermediate-felsic plutons, growth of volcanoes → stack less
dense material
Answer:
locally → UPLIFT
Q: exotic terranes
Answer:
Exotic terranes = fragments of crust found on margins of larger continents
with differ rocks types and characteristics than other rocks of similar age on
continent
,Geology 100 Exam #3 Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: Cordillera-type Orogeny: tectonic setting; exotic terranes; style of deformation
Answer:
→
Transported to continent by tectonic processes
Terranes are relatively thin pieces of continental crust (e.g., microcontinents or
volcanic island
arcs)
During collision the terranes are added to or accrete to the larger, more stable
continent
Q: Shear stress is conducted to relatively weak sedimentary strata blanketing the
continent
Answer:
→ "Thin-skin" tectonic deformation that extends into continent interior
Deformation propagates into interior from edge like a snow shovel pushing snow
, Geology 100 Exam #3 Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: abyssal plain
Answer:
1) Cooling and subsidence of oceanic
lithosphere
(isostasy!)
2) Deposition of pelagic sediment
Q: Fault-block mountains: extension; role of asthenosphere, basin and range
landscape
Answer:
Hypothesized that shallowly- subducting oceanic plate "detached" when its spreading
center approached the subduction zone
Falling of the cold, dense lithosphere in mantle strengthened convection in mantle
→ Localized upwelling of hot mantle under North America
→ Rift-like extension in southwestern United States and northern Mexico
