Volcano Types and Eruptions

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Presentation transcript:

Volcano Types and Eruptions Ms. Sheehan YVHS Geo-Science

Mr. Magner DHSHS Earth ScienceWords Essential Qs! Why are there two types of volcanic eruptions and how do they differ depending on the characteristics of their magma & location?

Warm Up: What is Viscosity, and what does it have to do with volcanic eruptions? What factors make lava or magma more/less viscous? Answer under essential questions…

A volcano is.. Your Objective: A weak spot in the crust where molten material, or magma, comes to the surface.

Magma vs. Lava Magma – a molten mixture of rock-forming substances, gases, and water vapor from the mantle. Lava – magma that has reached the surface of Earth

Location of Volcanoes Mr. Magner DHSHS Earth ScienceWords There are about 600 active volcanoes on land and many more beneath the oceans. Most volcanoes occur along diverging plate boundaries, such as the mid-ocean ridge, or in subduction zones around the edges of oceans. Mr. Magner DHSHS Earth ScienceWords

Volcanoes at Converging Boundaries cont. During oceanic and continental converging plates, mountainous volcanoes will form as in the Pacific Northwest of the United States During two oceanic converging plates, Island arcs will form as in the Caribbean Islands