of Earth Science |Northeastern
TO EARTH SCIENCE
Objectives #17 (October 21, 2008)
By the end of today's class, you should be able to do the following:
FROM LAST TIME:
Perform the steps necessary to complete Homework Assignment #8.
List the geotectonic
settings in which volcanoes occur (subduction zones, divergent zones, hotspots).
Tell why volcanoes
occur at each of these settings.
Describe the differences
in volcanoes based on these characteristics:
-- the materials erupted (lava, pyroclastics, ash, gas)
-- volcano shape (stratovolcano, shield, "cinder cone", "dome"), and
-- eruptive style (sudden/explosive vs. frequent/calm).
Explain how viscosity of
magma influences volcano shape/profile, and what determines the magma viscosity.
Explain how each of the
above characteristics is influenced by the geotectonic setting of the
© 2008 Laura L. Sanders. Last updated October 21, 2008.