Geo Sci Final Class Study Guide - surface where they cool...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
s tend to be more explosive than basalt and andesite eruptions. Geo Sci Final Class Study Guide Magmas and Volcanoes Major magma types - Basalt o Highest temperatures and lowest Silica content o Low viscosity o Easiest fluid flow o Black to dark grey o “Peaceful” eruptive style o 80% of magma reaching the Earth’s surface is basaltic Andesite o Medium to dark grey o Medium Silica content o Lower viscosity o Mild eruptive style - Dacite - Rhyolite o Lowest temperatures and highest Silica content o HIGH viscosity o Rarely flows o Light-colored o “Explosive” eruptive style o 10% of magma reaching the Earth’s surface is rhyolitic Fundamental differences between magma types - Basaltic magma has the lowest viscosity – more of it reaches the surface
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
- Rhyolite is more viscous so they are more sluggish and tend to be trapped deep below the
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: surface where they cool, solidify and grow into the larger mineral crystals of plutonic rocks such as granite-In low viscosity basalt magma, steam escapes easily and magma is low in dissolved water content-High viscosity rhyolite magma rises and steam bubbles form – they have difficulty escaping from the gooey magma and have to burst their way out How do these characteristics influence eruptions? How are magmas produced in the earth’s crust and mantle? Forms of difference volcanoes Why do volcanoes have different forms? Types of Lava How do lava types vary from each other? Where do volcanoes occur?...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern