Download
magma n.
Skip this Video
Loading SlideShow in 5 Seconds..
Magma PowerPoint Presentation

Magma

357 Views Download Presentation
Download Presentation

Magma

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. Magma

  2. Composition of Magma • Slushy mix of molten rock, gases, and mineral crystals • Elements in magma include: • Oxygen, Silicon, Aluminum, Iron, Magnesium, Calcium, Potassium, and Sodium. • Most abundant molecule is Silica.

  3. Formation of Magma • Temperature, Pressure, water content and mineral composition effect magma formation. • In the laboratory most rocks melt between 800-1200 degrees Celsius. • Increasing pressure raises the melting point • Increasing water content lowers the melting point. http://videos.howstuffworks.com/hsw/17137-whats-inside-the-earth-magma-inside-the-earth-video.htm

  4. Types of magma • Basaltic Magma • Formed in upper mantle, low silica and gas content, low viscosity. • Andesitic Magma • Formed when oceanic crust is subducted into mantle, medium silica and gas content, intermediate viscosity. • Rhyolitic Magma • Formed when molten rock mixes with silica and water rich continental crust, high viscosity, large volume of trapped gases. http://videos.howstuffworks.com/hsw/6186-mountains-of-fire-lava-video.htm

  5. Basaltic Lava

  6. Andesitic Lava

  7. Rhyolitic Lava

  8. Viscosity • Internal resistance to flow. • Ex. Honey, liquid soap, motor oil have higher viscosity than water, vinegar or gasoline.