Quiz 2 week #7
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El Paso Community College *
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Course
2
Subject
Geology
Date
Dec 6, 2023
Type
docx
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5
Uploaded by essm8163
QUIZ #2.
Answer all questions and turn in on Blackboard.
What is your name? Elmer Saenz
1.
(1 point) Which of the three main classes of stress would cause the clay layers to deform this way?
Compressional Stress
2.
What is the name of the structure shown in the image below, inside the black circle drawn onto the
photograph? (1 point)
Anticline Structure
3.
(6 points, one point per row)
Fill in the chart below. It compares types of plate boundaries with the
features and common hazards found there. You can mark an X in each box where it applies. (For
example, if there are earthquakes at a boundary where two oceanic plates diverge, mark an X in that
box)
Two oceanic
plates
converge
Two oceanic
plates
diverge
Two
continental
plates
converge
Two
continental
plates diverge
An oceanic
plate and a
continental
plate
converge
Two plates
slide past
each other
Earthquakes
x
x
x
x
x
x
Tsunamis
x
x
Volcanoes
x
x
Mountains
that
aren’t
volcanoes
x
x
Ridge made of
volcanoes in
the ocean
x
Deep trench in
the ocean
x
3. Volcano Scenario
Volcano X is a very active volcano in Central America.
It is formed by the subduction of the Cocos Plate under
the Caribbean Plate.
Rock layers on this large, steep sided (steeply sloping) volcano have been identified as
andesite, which is
relatively high in viscosity.
The seismic activity at Volcano X has been increasing in
frequency, intensity and magnitude.
Scientists are concerned that an eruption may be imminent.
Because of your knowledge of earth science, your friend who lives about 20 kilometers from the volcano has
asked you for advice.
They want to know some things about Volcano X and what types of hazards they may
expect from Volcano X.
A (1 point). What type of volcano (think of the three main classes of volcanoes) is Volcano X?
Explain your
reasoning (need explanation for full credit). (
Volcano X is a
composite or stratovolcanoe
.
Composite
volcanoes are also known as stratovolcanoes or stratocones. They are the most common type of volcano and are
formed by the eruption of viscous lava and ash. Composite volcanoes are typically steep-sided and conical in
shape, with a central vent.
Volcano X is described as being steep-sided and having erupted andesite lava. Andesite is a type of lava that is
relatively high in silica, which makes it viscous. This suggests that Volcano X is a composite volcano.)
B (1 point).
It is stated above that the Volcano X region is characterized by the subduction of the Cocos Plate
under the Caribbean plate.
Given that it represents a subduction zone, which of the following observations
would be most likely to happen in regards to the faults in the region when earthquakes happen on them?
(a)
Hanging wall moves up
(b)
Hanging wall drops down
(c)
Hanging wall and footwall move side-to-side laterally with regards to each other.
D. (1 point per answer) Your friend asks you which types of volcanic hazards they should prepare for from
this volcano.
Answer yes or no for each item below BUT ALSO EXPLAIN YOUR REASONING (you must give
an explanation for full credit).
1. Volcanic ash clouds in the sky and falling out over the area
Yes
. Composite volcanoes are known for producing explosive eruptions that can generate large ash clouds. Ash clouds can
travel long distances and can cause a number of hazards, including respiratory problems, damage to crops and
infrastructure, and disruptions to air travel.
2. Smooth, very liquid, black lava flows running down from the mountain
No
. Composite volcanoes typically erupt viscous lava that does not flow very easily. This type of lava is more likely to
form lava domes and pyroclastic flows, which are fast-moving mixtures of hot gas and rock.
3. Explosive eruption blast
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