Birth of a Volcano. What Causes Volcanoes? Effects of Plate Tectonics Forces from Within the Earth.
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Transcript of Birth of a Volcano. What Causes Volcanoes? Effects of Plate Tectonics Forces from Within the Earth.
![Page 1: Birth of a Volcano. What Causes Volcanoes? Effects of Plate Tectonics Forces from Within the Earth.](https://reader036.fdocuments.net/reader036/viewer/2022072016/56649ee75503460f94bf85d9/html5/thumbnails/1.jpg)
Birth of a Volcano
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What Causes Volcanoes?
• Effects of Plate Tectonics
• Forces from Within the Earth
![Page 3: Birth of a Volcano. What Causes Volcanoes? Effects of Plate Tectonics Forces from Within the Earth.](https://reader036.fdocuments.net/reader036/viewer/2022072016/56649ee75503460f94bf85d9/html5/thumbnails/3.jpg)
Plate Tectonics
Plate Tectonics, theory that the outer shell of the earth is made up of thin, rigid plates that move relative to each other.
![Page 4: Birth of a Volcano. What Causes Volcanoes? Effects of Plate Tectonics Forces from Within the Earth.](https://reader036.fdocuments.net/reader036/viewer/2022072016/56649ee75503460f94bf85d9/html5/thumbnails/4.jpg)
Tectonic plates are made of either oceanic or continental crust and the very top part of the mantle, a layer of rock inside the earth.
Tectonic Plates
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As the plates move, weak areas in the crust are created allowing molten rock, or magma, to well up to the earth’s surface.
![Page 6: Birth of a Volcano. What Causes Volcanoes? Effects of Plate Tectonics Forces from Within the Earth.](https://reader036.fdocuments.net/reader036/viewer/2022072016/56649ee75503460f94bf85d9/html5/thumbnails/6.jpg)
Forces from Within the Earth
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Anatomy of a Volcano
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Where Volcanoes Occur
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Changes Caused by Volcanoes
• Physical Changes to the Earth
• Environmental Changes
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Physical Changes
• New Land• Islands in the Ocean• Mountains and Plains
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Environmental Changes
• Initial impact• destroys living
environment
Long-term effectsslow recovery
new ecosystem
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Important Terms
• Plate Tectonics
• Tectonic Plates
• Continental Crust
• Ocean Crust
• Lithosphere
• Mantle
• “Ring of Fire”
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Volcano Quiz
• 1. What are tectonic plates?
• 2. Where do most volcanoes occur?
• 3. What is magma?
• 4. What is a “hot spot”?
• 5. Name one physical change and one environmental caused by volcanoes.
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References• http://pubs.usgs.gov/publications/text/dynamic.html
• This dynamic earth; example and sources
• http://encarta.msn.com/find/Concise.asp?ti=00C48000
• Encarta – brief descriptions of tectonics, plates and related
• http://library.thinkquest.org/17457/english.html
• Volcanoes web page
• http://www.thinkquest.org/library/lib/site_sum_outside.html?tname=17457&url=17457/
• Thinkquest activities, volcanoes