homework3-ans - Name: SIO 15: Homework 3 (Lectures 9, 10,...

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Name: SIO 15: Homework 3 (Lectures 9, 10, 11)- Fall Quarter 2007- Due October 26th 1.) What is viscosity? How does viscosity influence eruption style? List three eruption styles mentioned in lecture and their relative viscosities. (5pts) Viscosity is the internal resistance to flow or fluidity of a liquid. Lower viscosities have a more fluid behavior. Viscosity is controlled by temperature (higher temperature=lower viscosity) and by the amount of SiO2 (higher concentrations of SiO2=higher viscosity). Higher viscosity magmas have more violent or explosive eruption styles, on the other hand, lower viscosity magmas have more peaceful, non-explosive eruptions. Any of the following eruption styles will count: Icelandic : very low viscosity lava Hawaiian : low viscosity lava Strombolian : moderately high viscosity lava Vulcanian : high viscosity lava Plinian : very high viscosity lava Caldera : high viscosity (though calderas can also form with low-viscosity volcanism) 2.) List the two factors most relevant on Earth that cause a rock to melt. Associate each factor with a type of plate boundary. (4pts)
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homework3-ans - Name: SIO 15: Homework 3 (Lectures 9, 10,...

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