Michelle Cullen
Computer-Assisted
Language Learning
GED 565 B
Saint Michael’s College
Summer 2006
Michelle Cullen
macullen@adelphia.net
1
When you hear the
words “plate tectonics”
what comes to your
mind?
Michelle Cullen
macullen@adelphia.net
2
Here are some of the things
that come to my mind:
•Continents
•Oceans
•Crust
•Movement
•Volcanoes
•Earthquakes
Michelle Cullen
macullen@adelphia.net
3
Divergent Plate Movement
•Two plates move apart.
•Magma rises and forms
new crust. This creates
seafloor spreading.
•Creates ridges in the
ocean.
http://pubs.usgs.gov/gip/dynamic/understandi
ng.html#anchor6715825
Examples: Atlantic
Ocean, East African
Rift, Mid-Atlantic
Ridge
Michelle Cullen
macullen@adelphia.net
4
Convergent Plate Movement
•Oceanic crust
collides and slides
beneath the
continental crust.
•Volcanoes can form.
•Deep trenches can
form in the ocean.
http://pubs.usgs.gov/gip/dynamic/understanding.html#anc
hor6715825
Examples: Cascade Mountain Range,
Mount Saint Helens, and Andes
Michelle Cullen
macullen@adelphia.net
5
Transform Plate Movement
•Plates slide past each
other.
•Movement usually
occurs on the ocean
floor.
•Earthquakes can
occur when friction
and pressure build
up.
Examples: San Andreas Fault, Blanco
Fault, Mendocino Fault, Murray Fault,
and Molokai Fault
http://pubs.usgs.gov/gip/dynamic
/understanding.html#anchor6715
825
Michelle Cullen
macullen@adelphia.net
6
Location of Earthquakes and
Volcanoes
http://hsv.com/scitech/earthsci/quake.htm
Michelle Cullen
macullen@adelphia.net
7
How are the location of
the plates relate to the
location of earthquakes
and volcanoes?
•Most of the volcanoes and
earthquakes occur at the
edges of the plates.
Michelle Cullen
macullen@adelphia.net
8
References
•
•
•
•
•
Convergence of plates [This Dynamic Earth, USGS] R
Microsoft ClipArt
San Andreas fault [This Dynamic Earth, USGS]
Spreading Plate Boundaries
Understanding plate motions [This Dynamic Earth,
USGS] Retrieved on June 12, 2006.
• Virtual Times: Recent Earthquakes and Volcanoes
Retrieved on May 18, 2006
Michelle Cullen
macullen@adelphia.net
9