Plate type effect on volcanoes Advanced Mapping(1)(2) (1)
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Stockton University *
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2233
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Geology
Date
Dec 6, 2023
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docx
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Uploaded by SargentMoonPelican34
Plate type effect on volcanoes
Activity
Investigate how properties of volcanoes are influenced by the crust and plate boundaries nearest them.
Learning Outcomes
• Students will describe how magma is generated at plate boundaries and hot spots.
• Students will determine how melted crust involved in the creation of the volcanoinfluence volcano properties.
Map URL: http://esriurl.com/earthgeoinquiry8
Engage
Deep dish or cracker thin, is the earth’s crust all the same?
Click the pin on the Pacific Coast.
Click the image in the pop-up to see more detail.
What is this ocean’s average depth? 15,000 feet
What is the continent’s average elevation? 2,500 feet
On the map, it appears that there are generally two types of the earth’s crust.
If the earth’s crust were two types of ships floating on a sea of molten upper mantle, why would one ship sink so much lower in the liquid mantle than the other? The ocean bottom consists of different denser material
Explore
How else are the earth’s two crusts different?
Volcanoes form when melted crust (magma) cools at the surface (lava). Stickier, viscous, or more slow-flowing lava piles up steeply before solidifying. More easily flowing, less viscous lava spreads out broadly before cooling.
Click the Mount Rainier bookmark, and then click the arrow icon.
What does Mount Rainier’s shape imply about the runniness of the lava? More viscous
Which type of crust was melted for this volcano to form? The crust was continental. In Bookmarks, choose Mauna Loa, and then click the arrow.
What does the volcano’s shape imply about the runniness of its lava? The very broad peak suggests runt or low viscosity
Explain
How are other sticky solutions similar to lava? Juice is thin and runny making a broad puddle Think of lava like a sugar solution. Higher sugar content is more viscous and slower flowing.
How would the shape of a freshly poured puddle of juice compared to puddles of syrup or honey Juice is thin and runny making a broad puddle In a volcano, the amount of silicate acts like sugar in solution. Ocean plates have little silicate, while continental crust is rich in silicate. Like honey, continental volcanoes are steeper and more localized.
Elaborate
Does each plate type create its own distinct pattern of volcanoes? coverage boundary Click the Contents button. Turn on the Plate Boundaries and Global Volcanoes layers. Click different plate boundaries to see summary graphs of the types of volcanoes that occur within 250 miles.
Which boundary type has the most volcanoes? Juice is thin and runny making a broad puddle Which has the highest percentage of shield volcanoes (the portion in white)? Diverge plates Which boundary type has a higher percentage of cinder cone formation? Transform boundaries Evaluate
Why do many oceans have their own ridges? Where do volcanoes form near convergent boundaries? Why? (Zoom in for more detail.) Volacanos form to one side of a boundary Pan to a divergent boundary.
Is the same true for divergent boundaries?no
What happens to a continent over a divergent boundary? It would split the continent
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