Geology 10 (Physical Geology)

California State University, Sacramento

Week 3: The rock cycle, intrusive igneous rocks


Upon completion of this unit students should be able to:

  • Discuss the major types of rocks and the pathways of the rock cycle

  • Describe how crystal size is related to cooling rate

  • Define these terms: porphyritic, classy, pegmatite, coarse-grained

  • Classify intrusive igneous rocks by their chemistry or composition: mafic, intermediate and felsic.  Relate these terms to the rock names gabbro, diorite, and granite.

  • Be able to define and explain the terms country rock, dike, sill, pluton, stock and batholith

  • Describe how pressure, temperature and composition can affect melting

  • Relate plate boundaries to particular types of igneous rocks

  • Be familiar with Bowen's reaction series and how it controls magma crystallization and melting sequences

Homework for week #3
Complete the on-line multiple choice quiz for Chapter three (Intrusive igneous rocks).

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. 16

Reading Assignments

From Plummer, Carlson and Hammersley, Physical Geology, 13th edition

Chapter 3- Intrusive igneous rocks, rock cycle


Powerpoint graphics used during lectures


Week 3 graphics