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GEOL1303 Test 2 Spring2025 Flashcards | StudBud
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GEOL1303 Test 2 Spring2025
GEOL1303 Test 2 Spring2025
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Test 2 Review
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1
What does a metamorphic zone tell us?
That these rocks have the same depositional environment.
That these rocks have the same degree of metamorphism.
That these rocks have the same composition.
That these rocks are the same age.
2
Why would a fault plane have stria on it?
Because rocks are rough, and cause grooves as they move.
Glaciers moved over it.
Because dinosaurs clawed the surface.
They are apart of the lithification process.
3
If I originally have 100 g of U, how many grams of U will I have after 1 half life?
20 g
100 g
25 g
50 g
4
Which of the following creates a disconformity?
compression
intrusion
earthquake
erosion
5
A syncline fold...
Has all types of rock layers in the center.
has the youngest rock layers in the center
has the oldest rock layers in the center
has no rock layers in the center.
6
What type of structure is this?
Syncline
Monocline
Anticline
Fault
7
An anticline has the oldest part in the middle:
True
false
8
If I find a zeolite metamorphic facies, this indicates temperature and pressure ranges of:
500-700C; 10-14 kbar
600-1,000C; 0-14 kbar
100-300C; 0-2 kbar
100-300C; 6-14 kbar
9
Steno's principle of superposition states that
sedimentary rocks form layers that cover large areas.
layers on bottom were deposited before layers on the top.
a rock feature cutting across other rock layers is younger.
rock layers are originally deposited in horizontal layers.
10
If I have a sanidinite metamorphic faices, this indicated temperatures and pressures of:
100-300C; 0-2 kbar
600-1,000C; 0-15+kbar
750-950C; 1-2.5 kbar
400-800C; 8-15kbar
11
80% of all earthquakes occur at:
On the interior of continents.
The Alpide Belt
The Mediterranean-Asiatic Belt
The Circum-Pacific, encircling the Pacific Ocean.
12
Which one is an Angular Unconformity
X
Z
Y
W
13
A metamorphic rock sequence of zeolite to greenschist to amophibolite to sanidinite indicates:
An increase in pressure, but not really temperature.
An increase in temperature, but not really pressure.
An increase in temperature and pressure.
14
The Law of Superposition:
helps geologists determine the relative age of rock layers
says that the colors in different rock layers show the age
helps geologists determine the exact age of rocks
says heavier rocks are further down than lighter rocks
15
Which of the following can produce seismic waves?
Earthquakes
All of the above
Explosions
Volcanic Eruptions
16
What is an anticline?
Upward fold in earths crust
Downward fold in earths crust
17
Which of these index minerals indicates the highest -grade metamorphic rock?
Chlorite
Biotite
Sillimanite
Garnet
18
Which type of fault is associated with horizontal displacement along a fault plane?
Reverse faults
Normal faults
Earthquake faults
Strike-slip faults
19
80% of all earthquakes occur at:
The Circum-Pacific, encircling the Pacific Ocean.
On the interior of continents.
The Alpide Belt
The Mediterranean-Asiatic Belt
20
What are the three ways to metamorphose a rock?
Erosion, Weathering, and Lithification.
Lithification, Exhumation, and Fluid Activity.
Heat, Pressure, and Lithification.
Heat, Pressure, and Fluid Activity.
21
The elastic rebound theory explains:
how plates move throughout time.
how plates rebound after an earthquake.
how the plates stay the same during deformation.
the existence of faults.
22
Most earthquakes are how deep?
Intermediate, between 100-300 km.
Shallow, <100 km.
Located in the core.
Deep, >300 km.
23
What type of structure is this?
Syncline
Monocline
Anticline
Fault
24
San Andres Fault Zone is a convergent plate boundary, each side moves parallel to each other.
False
True
25
What kind of fault is this?
Transform
Reverse
Normal
26
How does a metamorphic rock obtain a foliated texture?
Intense heath, partially melting the minerals.
Deposition of precious metals during hdyrothermal activity .
Extra fluid activity, dissolving the minerals.
Differential pressure, aligning the minerals.
27
A disconformity is an example of an unconformity
true
false
28
Uniformitarianism
Process that breaks down rock and other substances
Geologic processes aren't even real
Geologic process that operate today also operated in the past
Geologic processes are completely different now from the past
29
A seismic wave:
is the wave of water that crashes along the beach.
always does damage.
is a wave of energy that travels through the earth's layers.
is only generated by earthquakes.
30
What is a metamorphic rock?
Rocks formed from sediments.
Beach particles.
Volcanic rocks.
Rocks that have transformed into another type of rock.
31
What kind of force was needed to create this type of fault?
Compression (pushing together)
Tension (pulling apart)
Shearing (sliding past each other)
32
What is a nonconformity?
An erosional gap in the rock record
A contact between sedimentary and other rock types
A method of matching similar rock layers
33
According to the principle of cross-cutting relationships, an intrusive rock body is
younger than the rock it intrudes to
older than the rock it intrudes to
always made of the same material as rock around it
deposited as sedimentary layers
34
Which is a feature commonly seen in mountain belts?
Granitic plutons and regional metamorphism in the interior
All of the above
Linear, elongate geometries.
Intense deformation
35
What kind of fault was that then?
Transform (result of shear)
Normal (result of tension)
Reverse (result of compression)
36
What is the half life of uranium? (use the graph) Hint: what amount of U is left at 1-half life?
10 billion years
2 billion years
4.5 billion years
Forever...?
37
A metamorphic facies can tell us:
Rate of movement for a rock type.
Depositional environment for a rock type.
Hydrothermal activity for a rock type.
Temperature and pressure ranges for a rock type.
38
What is classified as a mountain?
High area of land with 300 m of relief.
Rolling hills with 100 m of relief.
Depression in the surface, filling with water.
Buttes forming in the southwest-flat topped, isolated, small
39
Metamorphic rocks going from clay to chlorite to muscovite to containing garnets indicates:
An increase in metamorphic grade.
No change in metamorphic grade.
A decrease in metamorphic grade.
40
Is this a syncline?
Yes
No
41
How are metamorphic rocks classified?
By location and crystal size.
By depositional environment and composition.
By grain size and foliation.
By grain texture and composition.
