M1 Worksheet (1)
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School
Portland Community College *
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Course
106
Subject
Geology
Date
Dec 6, 2023
Type
docx
Pages
3
Uploaded by MateProton9678
Below is a list of many vocabulary words/terms that apply to this Module.
You do not have to
define them here, but you will need to know the definitions.
You will also need to know how
the vocabulary words/terms relate to others on the list (and possibly other Module’s lists).
Try
to use as many of these vocabulary words/terms as you can in answering the questions.
Accretionary Wedge (sometimes called Accretionary Complex), Active Continental Margin,
Asthenosphere, Atom, Atomic Number, Axial Tilt, Bar Magnet, Basalt, Continent, Continental
Arc, Continental Rift (Sometimes simply called a Rift), Continental Rise, Continental Slope,
Convection Cell, Convergent Boundary, Core (Outer and Inner), Crust, Density, Divergent
Boundary, Electron, Element, Fracture Zone, Granite, Gravity, Hotspot, Iron, Island Arc, Isostatic,
Lithosphere, Magnetism, Mantle, Melting Point, Mesosphere, Mid-Ocean Ridge (Sometimes
simply called a Ridge), Mid-Ocean Rise (Sometimes simply called a Rise), Moon, Nebular
Hypothesis, Neutron, Ocean, Nickel, Outgassing, Passive Continental Margin, Plastic (with regard
to matter), Proton, Radiometric Dating, Seamount, Shelf Break, Silicate, Spreading Center,
Subduction Zone, Temperature, Theia, Transform Boundary, Trench,
Viscosity
1.
Go to
https://solarsystem.nasa.gov/planets/in-depth/#:~:text=The%20most%20recent
%20definition%20of%20a%20planet%20was,a%20star%20%28in%20our%20cosmic
%20neighborhood%2C%20the%20Sun%29
to find the official definition of a planet.
Describe
how the Nebular Hypothesis fits with the each of the three parts of the definition.
2a.
Use Diagram 1 below to explain why the Asthenosphere is considered “plastic”.
Use the
definition of the term plastic, and what you see in the diagram to answer this.
2b.
Use Diagram 1 below to explain what the curves would look like in relationship to one
another in both the Outer Core and the Inner Core.
Hint: Imagine what the Melting Point Curve
would look like on the image on the right.
Diagram 1 – Geotherm and Melting Curve of the Earth’s Interior
From:
https://opentextbc.ca/physicalgeology2ed/chapter/9-2-the-temperature-of-earths-
interior/
NOTES: 1.
The Geotherm Curve (solid black line) is a graphic representation of temperatures
with depth inside the Earth.
2.
The Melting Curve (dashed red line) is a representation of the states of matter possible inside
the Earth, given the temperature and pressure at each depth.
Notice the rocks will be solid on
one side of the Melting Curve and liquid on the other.
3.
LVZ stands for Low Velocity Zone.
In this case, velocity refers to molecular movement.
4.
The darker green color represents the Mesosphere, so substitute the word Mesosphere for
Mantle.
5.
The image on the left is and enlargement of a portion of the image on the right.
3.
Setup:
Use Diagram 2 below to find two locations that are roughly equal distances from
land: Southwest Indian Ridge (boundary between the Antarctic Plate and the eastern part of
African Plate) and the Chile Rise (boundary between the Antarctic Plate and the Nazca Plate).
Take note of the spreading rates along each boundary.
Now, go to Google Earth.
You don’t
need to download it, as there is an experimental version online that can be used.
Type in the
names, one at a time, of the each of the locations above in the search icon.
Take note of the
depths at each location (use the specific spots you are given with the search, and you may have
to zoom in to see the depth in meters on the bottom left).
Question: Use the data you collected to explain the difference between a rise and a ridge, even
though they are the same type of boundary.
Diagram 2 – Relative Plate Motions in mm/yr
https://www.open.edu/openlearn/mod/oucontent/view.php?
id=2452&extra=thumbnailfigure_idm257
4a.
On Google Earth, and Diagram 2, locate Baja California.
Describe the types of Continental
Margins that exist on either side, and why?
4b.
Explain why this location may be an “odd” example of one of those Continental Margins.
5.
Find Kuril Islands on Google Earth.
What are they, and why are they like and different than
the Andes Mountains?
6.
Between the Continental Shelf, the Continental Slope, and the Continental Rise, which one is
the actual boundary between continental crust and oceanic crust?
Explain.
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