Plates Tectonics Group Project-2
.docx
keyboard_arrow_up
School
Arizona State University *
*We aren’t endorsed by this school
Course
45453
Subject
Geology
Date
Feb 20, 2024
Type
docx
Pages
5
Uploaded by EarlFreedom5623
Plate Tectonics Group Project GLG
101 Spring 2024 Instructions You will be drawing a cross section across several plate boundaries. Use what you have learned in lectures and in Chapter 2 of An Introduction to Geology, Johnson et al (2017) to 1) draw and annotate a cross section, 2) support your drawing with evidence. HINT: Chapter 2, Sections 2.2.2, 2.2.3, 2.3, 2.4 and 2.5 will be particularly helpful. What is a cross section??? In this context it’s a “slice” of the Earth where you can see what tectonic plates are doing below the surface. Usually, cross sections are drawn along a profile line along the Earth’s surface – this line will cross features of interest. In our case, that’s plate boundaries. Below is an example that I’ve sketched: Yours will be more detailed than this and will include annotations, which are given to you in the instructions below. Part 1 : Your cross section will be based on a line along the 15°N latitude line from 120°W to 0° (prime meridian) longitude, which can
be found using the Google Earth .kmz file provided on Canvas (
101_plate tectonics_cross section.kmz
). This file contains the profile line along which you will draw your cross section, plus overlays for earthquake events and volcanoes. For help with Google Earth, watch the Google Earth Instructions video provided on the Plate Tectonics Project page. Here’s how to access Google Earth: •
Start by downloading the Google Earth application on your computer. Here's a link: https://www.google.com/earth/versions/
. •
Click the "
Download Earth Pro on desktop
" button near the bottom of the page. Follow instructions to install. Note: the browser version will not work
, so please do not use it. •
Click to open Google Earth application on your computer. •
Now that you have Google Earth installed and open, go to the course Canvas page and download the 101_plate tectonics_cross section.kmz
file to your computer (it’s in the Plate Tectonics Project page). Take note of where you saved the file on your computer because you’ll need to access it. •
In the Google Earth application, click File > Open and then browse to 101_plate tectonics_cross section.kmz
file and open the file. •
A folder named 101_plate tectonics_cross section
will show up in the Places panel on the left. •
Click the arrow to the left of 101_plate tectonics_cross section
to open the folder. You will see “profile”, “earthquakes”, and “volcanoes of the world” in the folder. If the box beside each of these is checked, you’ll be able to see the cross section (pink line), earthquakes (yellow, orange, red and blue dots) and volcanoes (blue triangles) on
your map. •
For help with Google Earth, watch the Google Earth Instructions video provided on the Plate Tectonics Project page. Drawing your cross section: •
The template for the cross section (Part 1 pdf) can be found on the Plate Tectonics Project page on Canvas. Print that
page and draw your cross section there or sketch using a computer or tablet. Make sure everyone in your group has access please. •
Compare the profile line in Google Earth to the first map in the Plate Tectonics Chapter (Chapter 2) of your online textbook to determine what plate boundaries are included in your assigned profile. Alternatively, Wikipedia has a
nice high resolution map of plate boundaries: https://upload.wikimedia.org/wikipedia/commons/9/9d/Tectonic_plates_boundaries_World_map_Wt_180degE_ce ntered-en.svg
. Tectonic plate names are in white letters that are outlined in black. The legend tells you which colors correspond to which plate boundary type. •
After you know what plate boundaries you are working with, use that information to decide where it would make sense to place them on the diagram from Part 1 in the assignment. Your sketch in Part 1 should have the longitude and latitude labeled on each side of the cross section. •
The cross section crosses multiple plates and should be drawn down to the asthenosphere. •
For your horizontal scale, you can estimate distances between features in your cross section using the ruler tool in Google Earth (see the Google Earth instructions video for help). The horizonal distance between plate boundaries should be scaled correctly. •
For your vertical scale, 1) the relative thickness between the oceanic and continental crust and the lithospheric mantle should be realistic and 2) the relationship between lithosphere and asthenosphere at plate boundaries should be clear. •
Clearly place on the cross section all the features listed in the key using the symbols provided at the bottom of the Part 1 pdf. Please draw carefully and use all of the space provided. Make sure your group cross section has all of the following items: ●
Names of the tectonic plates (label them above the cross section and make sure you indicate with a dashed vertical line the edges of the plate extending from the plate boundary to the top of the diagram). You can find the names in the first map in section 2.2.2 Physical Layers in the textbook online. ●
Draw an arrow under the plate name to show the direction it is moving. ●
Show variations in thickness of the oceanic and continental crust. ●
Use an arrow from the melting area to the volcanic activity to show where melting is occurring at depth and connect this melting to volcanoes or volcanic vents at the surface. ●
See the checklist
in the assignment to make sure you have included everything you need! Cross section checklist: General ___ All content is neat, clear and legible. If we can’t read your text, we can’t grade it. Location ___ Longitude and latitude of each side of the cross section labeled. Tectonic plates ___ Plates named & labelled. ___ Correct plate directions are indicated for each plate. ___ Horizontal distance between plate boundaries is scaled correctly. Crust, mantle, lithosphere ___ Continental crust and oceanic crust are labelled according to legend. ___ Relative thicknesses of continental and oceanic crust are correct. ___ Lithospheric mantle and asthenosphere labelled are labelled according to legend. Plate Geometries ___
Trench(es)/subduction zone(s) are identified where appropriate. ___ Subducting slab(s) drawn at appropriate angle. ___ Mid-ocean ridge(s) are identified where appropriate. Earthquakes ___ Earthquake activity is labelled in all relevant locations. Volcanoes ___ All areas of melting are properly indicated where appropriate. ___ Volcanic arc(s) labelled where appropriate. ___ All areas of volcanic activity labelled where appropriate. We may need it in part 1:
0 m Elevati
on
La
t:
Lo
n:
La
t:
Lo
n:
KE
Y
E = Earthquake Origin
V = Area of Volcanic Activity
M = Area of Melting
SZ = Subduction Zone
VA = Volcanic Arc
T = Trench
MOR = Mid
-Ocean Ridge
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help