Department
of Earth Science |
Northeastern
Illinois University
INTRODUCTION
TO EARTH SCIENCE
ESCI
121
Spring
2007
Daily Objectives
#11 (February
21, 2007)
Dr. Sanders
By the end
of
today’s class, you should be able to do the
following:
Igneous Minerals,
Igneous Rocks
* Review: Explain the
relationship between cooling rate and crystal size in an
igneous rock.
* Review: Explain the
difference between rock and minerals of a mafic (basaltic) composition
and felsic (granitic) composition, and tell how to recognize each
type in a hand sample.
* Review: Sketch a "melting
curve" on
a graph with axes showing temperature and
pressure. Show on which sides of the curve liquids and solids
would exist.
* Review: On the
graph, sketch another curve, for a rock material that melts at a higher
temperature. Label the two curves to show which one
illustrates melting of silica-rich material, and which one
illustrates melting of silica-poor material.
* Finish viewing
the
Discovery Channel Raging Planet series film, "Volcano!"
* Describe the
three main shapes/profiles of volcanoes, and explain why they are
different and how it determines their eruptive style.
* Describe and
explain the connections between a volcano's location and plate tectonic
setting, types of tectonic plates involved, mineralogic composition of
the magma (felsic, mafic, intermediate), volcano shape/profile (cinder
cone/dome, composite cone/stratovolcano, shield), volcano eruptive
style, silica content of the magma, melting temperature of the rock
material (higher/lower), and the material erupted from the volcano
(e.g. gas, pyroclastics, lava).
© 2007 Laura L. Sanders. Last updated
February 21, 2007.