Geology 102 Exam 2 NEWEST 2025
ACTUAL EXAM COMPLETE 100
QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+
Plutonic Structures - ANSWER-Not one solid rock
Dike - ANSWER-A cross body that cuts layers
Sill - ANSWER-Runs parallel to the layers
What is a volcano? - ANSWER-A vent through which magma, solid rock
debris, and gases are ejected
How are volcanoes classified? - ANSWER-- They are classified by the
type of eruption
,- Largely a function of viscosity and dissolved gas content of the magma
What is viscosity? - ANSWER-The resistance of a liquid to flow
- Magma/Lava with high silica content have a high viscosity (they are
thick, not runny)
- Silicic melt has a high viscosity
What are the two types of volcanoes? - ANSWER-Non-Explosive
Explosive
Non-Explosive - ANSWER-- Low viscosity (flows easily)
- Low silica content (mafic)
- Basaltic magma/lava
- Shield Volcanoes
Explosive - ANSWER-- High viscosity (resists flow)
- High silica content (intermediate, felsic)
- Andesitic or granitic magma/lava
- Composite (Strato) Volcanoes
What are the two types of non-explosive eruptions? - ANSWER-
Hawaiian and Strombolian
, What are the two types of explosive eruptions? - ANSWER-Vulcanian
and Plinean
Hawaiian Eruptions - ANSWER-- Shield Volcanoes
- Usually mafic lava
- Non-explosive
- Continuous eruptive cycles
Shield Volcanoes - ANSWER-- Produce non-explosive eruptions
- Gentle slopes, layered/successive lava flows
Fissure Flows - ANSWER-Weak spot exploited by the magma chamber
Basalt Flows - ANSWER-- Result from fissure flows
- Lava emerges from elongate fractures or fissures and spreads widely
to create vast, flat lava plains, sometimes covering lots of land
Strombolian Eruptions - ANSWER-- Cinder Cone Volcanoes
- Mafic Lava
- Not super explosive
- Frequent eruptions
ACTUAL EXAM COMPLETE 100
QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+
Plutonic Structures - ANSWER-Not one solid rock
Dike - ANSWER-A cross body that cuts layers
Sill - ANSWER-Runs parallel to the layers
What is a volcano? - ANSWER-A vent through which magma, solid rock
debris, and gases are ejected
How are volcanoes classified? - ANSWER-- They are classified by the
type of eruption
,- Largely a function of viscosity and dissolved gas content of the magma
What is viscosity? - ANSWER-The resistance of a liquid to flow
- Magma/Lava with high silica content have a high viscosity (they are
thick, not runny)
- Silicic melt has a high viscosity
What are the two types of volcanoes? - ANSWER-Non-Explosive
Explosive
Non-Explosive - ANSWER-- Low viscosity (flows easily)
- Low silica content (mafic)
- Basaltic magma/lava
- Shield Volcanoes
Explosive - ANSWER-- High viscosity (resists flow)
- High silica content (intermediate, felsic)
- Andesitic or granitic magma/lava
- Composite (Strato) Volcanoes
What are the two types of non-explosive eruptions? - ANSWER-
Hawaiian and Strombolian
, What are the two types of explosive eruptions? - ANSWER-Vulcanian
and Plinean
Hawaiian Eruptions - ANSWER-- Shield Volcanoes
- Usually mafic lava
- Non-explosive
- Continuous eruptive cycles
Shield Volcanoes - ANSWER-- Produce non-explosive eruptions
- Gentle slopes, layered/successive lava flows
Fissure Flows - ANSWER-Weak spot exploited by the magma chamber
Basalt Flows - ANSWER-- Result from fissure flows
- Lava emerges from elongate fractures or fissures and spreads widely
to create vast, flat lava plains, sometimes covering lots of land
Strombolian Eruptions - ANSWER-- Cinder Cone Volcanoes
- Mafic Lava
- Not super explosive
- Frequent eruptions
