GS104

Week 9 student objectives   

Igneous and Volcanic structures 

1.   List and describe the factors that affect the viscosity of magma and predict which kinds of magmas would be the most explosive.

2.   Know what the term  pyroclastics means

3.   Differentiate between the following volcanic features in terms of rock type and structure:

a.  cinder cone                                                  d.  flood basalt  

            b.  lava (volcanic) dome                                     e.  composite (strato) volcano

            c.  shield volcano                                               f.  caldera

4.   Differentiate between the following:

            a.  lava tube                                                      e.  intracanyon flow 

            b.  vent                                                             f.  pyroclastic flow

            c.  pillow lava                                                    g.  volcanic neck

            d. lahar

5.   What is columnar jointing and how does it form?       

6.   Define the term Aplutonic@ and describe the following plutonic structures:

            a.  dikes                                                            c.  batholiths

            b.  sills                                                              d.  stocks

7.   Describe the kinds of volcanic activity associated with plate boundaries.

            a.  spreading center volcanism

            b. subduction zone volcanism. 

8.  Describe the Aring of fire@

9.   List and describe the geologic hazards associated with different types of volcanoes.