Inside Earth Chapter 3 Volcanoes 3.1 Volcanoes and Plate Tectonics

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Presentation transcript:

Inside Earth Chapter 3 Volcanoes 3.1 Volcanoes and Plate Tectonics

3.1 Volcanoes and Plate Tectonics Key Concepts Where are most of Earth’s volcanoes found? How do hot spot volcanoes form?

3.1 Volcanoes and Plate Tectonics Key Terms Volcano – A weak spot in the crust where magma has come to the surface. Magma – The molten mixture of rock-forming substances, gases, and water from the mantle. Lava – Liquid magma that reaches the surface. Also the rock formed where liquid lava hardens.

3.1 Volcanoes and Plate Tectonics Key Terms Ring of Fire – A major belt of volcanoes that rims the Pacific ocean. Island arc – A string of island formed by the volcanoes along a deep-ocean trench. Hot spot – An area where magma from deep within the mantle melts through the crust above it.

Divergent Plate Volcanoes At the mid-oceanic ridges, two tectonic plates diverge from one another as new oceanic crust is formed by the cooling and solidifying of hot molten rock.

Divergent Plate Volcanoes

Convergent Plate Volcanoes Subduction zones are places where oceanic plate dives beneath continental plate. The oceanic crust melts creating magma. When The magma reaches the surface, a volcano is formed. Ring of fire

Convergent Plate Volcanoes

Ring of Fire

Hot Spot Volcanoes "Hotspots" is the name given to volcanic areas believed to be formed by very hot locations in the earths mantle. Hawaii - was formed this way

Hawaii Hot Spot