Lab 6 - Volcanoes mohamed sbei
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Geology
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Apr 3, 2024
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Lab 6 Volcanoes
Name: Mohamed Sbei In-class lab exercises
Part 1 Interpretation of Crater Lake and Mount Saint Helens
Open Google Earth Pro on your computer. Search for “Mount Saint Helens, WA” in the box at the top left of your screen. Zoom in or out
until you can clearly see the mountain and crater.
What do you notice about the landscape in the image? Is there vegetation, or something else?
There is no vegetation its snow.
Then use the ruler tool to draw a topographic profile from west to east across the center of the crater. Select the “Ruler” tool, and click on the “Path” tab. Check the box for “Show elevation profile”. Then draw your straight-line path across the crater. You should see the topographic profile beneath your map.
In order to save this image, click on “Edit” then “Copy image”. Paste the image below.
Label the ends of your profile with “west” and “east”. You should have both the map and the profile. Looking at the shape of your profile and the shape of the mountain on Google Earth, describe the shape of the crater. Where are the steep and shallow slopes?
The steep slopes are on the sides of the crater and in the middle its more shallow.
What caused this crater to form? Volcanic activity
What is the geologic feature in the center of the crater and how did it form?
A lava dome and it was formed by slow extrusion of high silicic lava.
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Next, search for “Crater Lake, Klamath County, OR” in the box at the top left of your screen.
Do the rivers on the map flow towards the lake or away from it?
There is no way for water to enter it what ever is in it eventually evaporates and when it rains again it hold the water. Crater Lake wasn’t always a lake. With the previous question in mind, where did the water in Crater Lake come from?
From Rain.
Use the area tool on Google Earth to calculate the area of Crater Lake. Write your answer below.
Around 20.39 square miles Using the same techniques that you used for Mount Saint Helens (above), create a cross-section from west to east across the center of Crater Lake, and paste the image below.
Looking at the shape of the mountain on Google Earth, describe the shape of the crater. Where are the steep and shallow slopes? The shape is round and the steep and shallow slopes are in lines almost looks like bands the one that are darker are more steep and the ones that are lighter are more shallow
.
What geologic feature is Crater Lake?
A caldera.
What geologic feature is Wizard Island?
Cinder cone.
Consider both Mount Saint Helens and Crater Lake when you answer the following questions.
What type of volcanoes are Mount Saint Helens and Crater Lake?
Stratovolcano.
What type of magma would you expect to be present here? Why?
Silica rich magma
.
At what type of plate boundary would this type of volcano form?
A subduction zone.
How does magma form at this type of plate boundary?
At high temperatures. Scroll out on Google Earth to see the locations of both Mount Saint Helens and Crater Lake on one page. Does this location correlate to the type of plate boundary you predicted? Why?
Yes because they are both on a convergent boundary Which two tectonic plates meet at this location?
(go back to the textbook or your lecture
notes on plate tectonics)
Juan de Fuca Plate and the North American Plate.
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