PlateBoundaries-Activity-Sp21
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University of North Carolina, Chapel Hill *
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101
Subject
Geology
Date
Dec 6, 2023
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docx
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Uploaded by BrigadierBuffalo1397
Plenge Sp21 Tectonic Boundaries (30 pts)
Your name Poojha Palle
Group # ______
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Purpose:
To use observational evidence to find plate boundary, and to correlate specific types of evidence to
specific types of plate movement.
Materials: (1)
Case study maps and key (available in class and on Sakai),
(2)
This worksheet,
(3)
etext and/or
notes from Chapter 4.5,
(4)
Reading on boundary types (available on Sakai)
Part 1. Match features with boundaries (5 pts).
Instructions:
1.
Use chapter 4 from text and “Notes of boundary types” to describe plate boundaries in
Table 1
(pg. 1).
Describe each boundary in terms of data you could collect (e.g., seafloor age, elevation) rather than
processes we infer (e.g., subduction).
Table 1. (5 pts) Fill out the box for each boundary using the words provided and/or descriptions as needed.
You only need to write something if you can get useful information about that plate boundary from that
piece of evidence. If not, write “N/A”
Associated
with
Boundary
type
Volcanoes? (yes
or no) &
describe
Earthquakes
(shallow, deep,
or both)
High elevation?
(yes or no) &
describe
Low elevation?
(yes or no) &
describe
Crustal age?
(young or
different ages,
N/A)
O-O
Divergent
No
Yes, shallow
Relatively high,
yes
No
Young
O-C
Convergent
Yes, very active
volcanic activity
near island
chains
Yes, varies from
shallow to deep
Low elevation
Yes, relatively low
on oceanic crust
Medium
O-O
Convergent
Yes, active
volcanic activity.
Caldera,
stratavolcanoes,
lava domes.
Yes, varies from
shallow to deep
Low elevation at
trenches
High at volcanic
islands
Old
C-C
Convergent
No
Yes, varies from
shallow to deep
Relatively high
elevation due to
mountains
No
N/A
C-C
Divergent
No
Yes, shallow;
moderate
volcanic activity,
strata, shield,
and caldera
volcanoes.
Low elevation
Relatively low
N/A
Part 2. Identifying boundaries based on features (20 pts)
1
1.
Work with your group to make observations about each case study. Use the key, and complete
Table 2
by
choosing the best answers to describe each boundary.
More than one answer can be chosen!
Example: if you see a high elevation features that is next to a plate boundary, but traces the general
shape of the plate boundary, you would choose “high elevation parallel to the boundary.”
2
3
(5 pts) Case Study I:
Boundary Type: Divergent
Volcanoes
a.
Are found right on top of the plate boundary
b.
Are found parallel to the plate boundary
c.
Are not really useful in drawing the plate boundary
Earthquakes
a.
Are found on top plate boundary
b.
Are found parallel to the plate boundary
c.
Are not useful in drawing the plate boundary
a.
All earthquakes are shallow
b.
Some earthquakes are shallow,
and some are deep
c.
All earthquakes are deep
Topographic
a.
High elevation on the plate boundary (relatively low on both sides)
b.
Low elevation on the plate boundary (relatively high on both sides)
c.
High elevation parallel to the plate boundary on one side
d.
Low elevation parallel to the plate boundary on one side
e.
Elevation is high on one side of the boundary and low on the other
f.
The relative elevation does not seem useful in drawing the plate boundary
Crustal age
(for oceanic
boundaries)
a.
The crust is uniformly young on top of the plate boundary, and gets older moving away
b.
The crust is uniformly old on top of the plate boundary, and gets younger moving away
c.
The age of the crust is not useful in determining the location of the plate boundary
(5 pts) Case Study II:
Boundary Type: O-C Divergent
Volcanoes
a.
Are found right on top of the plate boundary
b.
Are found parallel to the plate boundary
c.
Are not really useful in drawing the plate boundary
Earthquakes
a.
Are found on top plate boundary
b.
Are found parallel to the plate boundary
c.
Are not useful in drawing the plate boundary
a.
All earthquakes are shallow
b.
Some earthquakes are shallow,
and some are deep
c.
All earthquakes are deep
Topographic
a.
High elevation on the plate boundary (relatively low on both sides)
b.
Low elevation on the plate boundary (relatively high on both sides)
c.
High elevation parallel to the plate boundary on one side
d.
Low elevation parallel to the plate boundary on one side
e.
Elevation is high on one side of the boundary and low on the other
f.
The relative elevation does not seem useful in drawing the plate boundary
Crustal age
(for oceanic
boundaries)
a.
The crust is uniformly young on top of the plate boundary, and gets older moving away
b.
The crust is uniformly old on top of the plate boundary, and gets younger moving away
c.
The age of the crust is not useful in determining the location of the plate boundary
(5 pts) Case Study III:
Boundary Type: O-O Convergent
Volcanoes
a.
Are found right on top of the plate boundary
b.
Are found parallel to the plate boundary
c.
Are not really useful in drawing the plate boundary
Earthquakes
a.
Are found on top plate boundary
b.
Are found parallel to the plate boundary
c.
Are not useful in drawing the plate boundary
a.
All earthquakes are shallow
b.
Some earthquakes are shallow,
and some are deep
c.
All earthquakes are deep
Topographic
a.
High elevation on the plate boundary (relatively low on both sides)
b.
Low elevation on the plate boundary (relatively high on both sides)
c.
High elevation parallel to the plate boundary on one side
d.
Low elevation parallel to the plate boundary on one side
e.
Elevation is high on one side of the boundary and low on the other
f.
The relative elevation does not seem useful in drawing the plate boundary
Crustal age
(for oceanic
a.
The crust is uniformly young on top of the plate boundary, and gets older moving away
b.
The crust is uniformly old on top of the plate boundary, and gets younger moving away
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Part 3. Questions (5 pts)
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The cross section shows an ocean-continental convergent boundary.
1.
(3 pts) A specific relationship can be drawn between
earthquake depth and distance from a subduction-zone
boundary.
Explain this relationship, and why this relationship
exists.
Use the diagram to help you.
The Wadati Benioff zone. The descending plate bends and fractures as it is pulled down into the mantle
causing shallow earthquakes to occur. Earthquakes happen only in the cool and brittle lithosphere. The
lithosphere eventually loses its brittle nature as it warms up as it descends into the hotter mantle. This is
where deeper earthquakes occur due to increasing temperature and pressure of mantle.
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
2.
(1 pts) Which 2 features should you look for when looking for an ocean-ocean divergent boundary?
a.
Oceanic ridge
b.
young crust
3.
(1 pt) Which of the diagrams below accurately shows the movements (arrows) associated with the surface
features shown in the diagram? You may select your choice by deleting the incorrect choices
4