California State University, Sacramento
Week 4: Volcanoes and extrusive igneous rocks
Upon completion of this unit students should be able to:
Discuss how temperature and silica content affect lava
Define the terms lava, viscosity, magma, vesicular, frothy, fragmental
Be familiar with textural terms for extrusive rocks: glassy, finely crystalline, groundmass, porphyritic, obsidian
Discuss the chemical composition of basalt, andesite and rhyolite
Differentiate between the main types of volcanoes: cinder cones, composite cones (stratovolcanoes), shield volcanoes, volcanic domes
Homework for week #4 Complete the on-line multiple choice quiz for Chapter four (Volcanoes).
E-mail it to me at:
Please note: This is different from my CSUS e-mail address!
You can find the quiz by following this link:
Click on the “Resources” tab at the top of the page, and scroll down to the chapter that you want to work on. Complete the multiple choice quiz on-line, and e-mail the results to me.
Due date for homework: The start of class on Friday, Sept. 23
From Plummer, Carlson and Hammersley, Physical Geology, 13th edition
Chapter 4- Volcanoes and extrusive igneous rocks
Powerpoint graphics used during lectures