Describe the key characteristics of shield volcanoes. How do they form, and what types of eruptions are they known for?

Broad and dome-shaped, basaltic lava (dough, toothpaste). Form at mid-ocean ridges (pull away = lava up) . Known for non-explosive basaltic eruptions.

What are the main features of composite (stratovolcano) cones? How do their eruptions differ from those of shield volcanoes?

Most of them are located near Pacific Ocean, they are large, “normal” shaped volcanoes, and they are the most violent type activity. They often produce pyroclastic flows. Different by being more explosive.

Compare and contrast the lava composition found in shield volcanoes versus composite cones.

Shield has low silica content, low viscosity; they have lava flows with some explosive activity, but they mostly move like toothpaste. Composite has a higher silica content and has more viscosity to it; they have explosive activity and lava flows.

Explain why shield volcanoes are generally larger but have gentler slopes compared to composite cones. What geological processes contribute to this difference?

They are generally larger with gentler slopes because the type of eruptions they have are calmer and cools down much slower, allowing the lava to flow far distances before solidifying. The low silica content and low viscosity allows this.

How does the composition of shield and composite cone volcanoes influence their shape and eruption style?

Because the lava flows out like toothpaste for shield due it its low silica and viscosity, the lava is able to go great distances without piling up. Composite volcanoes are more explosive and the lava tends to cool quickly at the vents.

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EAR Chap5

Volcanoes

Question	Answer
Describe the key characteristics of shield volcanoes. How do they form, and what types of eruptions are they known for?	Broad and dome-shaped, basaltic lava (dough, toothpaste). Form at mid-ocean ridges (pull away = lava up) . Known for non-explosive basaltic eruptions.
What are the main features of composite (stratovolcano) cones? How do their eruptions differ from those of shield volcanoes?	Most of them are located near Pacific Ocean, they are large, “normal” shaped volcanoes, and they are the most violent type activity. They often produce pyroclastic flows. Different by being more explosive.
Compare and contrast the lava composition found in shield volcanoes versus composite cones.	Shield has low silica content, low viscosity; they have lava flows with some explosive activity, but they mostly move like toothpaste. Composite has a higher silica content and has more viscosity to it; they have explosive activity and lava flows.
Explain why shield volcanoes are generally larger but have gentler slopes compared to composite cones. What geological processes contribute to this difference?	They are generally larger with gentler slopes because the type of eruptions they have are calmer and cools down much slower, allowing the lava to flow far distances before solidifying. The low silica content and low viscosity allows this.
Discuss the role of tectonic plate boundaries in the formation of shield and composite volcanoes. Which types of plate boundaries are most commonly associated with each type?
Identify an example of a well-known shield volcano and a composite cone. Describe how their eruption history has shaped the surrounding landscape
How do the hazards associated with shield volcanoes differ from those of composite cones? What factors make one type potentially more dangerous than the other?
Why are pyroclastic flows more commonly associated with composite cones than with shield volcanoes? What geological conditions lead to this phenomenon?
Discuss how the viscosity of magma affects the eruption style of shield and composite volcanoes. How does this factor contribute to the differences in their structure?
How do volcanic gases influence the explosiveness of eruptions in shield versus composite volcanoes? Which type tends to release more gas, and why?
How does the composition of shield and composite cone volcanoes influence their shape and eruption style?	Because the lava flows out like toothpaste for shield due it its low silica and viscosity, the lava is able to go great distances without piling up. Composite volcanoes are more explosive and the lava tends to cool quickly at the vents.

Created by: PracticeMakesPerfect

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