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Volcano - PowerPoint PPT Presentation
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Volcano. By Catherine, Melanie, and Manisha. What is a Volcano?. Volcano is an opening or a vent in the surface of the earth through which magma and gases escape. Magma is molten rock located beneath the surface of the earth. . Why Do Volcanoes Erupt?. Volcanoes erupt
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Volcano
By Catherine, Melanie, and Manisha
What is a Volcano?
- Volcano is an opening or a vent in the surface of the earth through which magma and gases escape.
- Magma is molten rock located beneath the surface of the earth.
Why Do Volcanoes Erupt?
Volcanoes erupt
because of changes in
- Temperature
- Viscosity
- Dissolved Gases in Magma
- Pressure
How Are Rocks Formed?
- Sedimentary rocks – Small pieces of rocks are deposited by wind or water and compressed.
- Igneous rocks - Magma trapped in reservoirs cools down.
- Metamorphic rocks - Sedimentary and igneous rocks under high pressure and build up of heat change into metamorphic rocks.
Resources
- http://vulcan.wr.usgs.gov/Outreach/AboutVolcanoes/what_is_a_volcano.html
- http://www.fi.edu/fellows/fellow1/oct98/create/sediment.htm
- http://www.educypedia.be/education/geologyanimations.htm
