Download NOTES Divergent and Transform Boundaries.notebook

NOTES Divergent and Transform Boundaries.notebook
December 17, 2015
Divergent Boundaries
Divergent and Transform Boundaries
move
apart
A place where two plates _____________ ____________
• Ridge
underwater
A divergent boundary that occurs ____________________ ridge
is called a ________________
sea floor
Creates a process known as _________ ____________
spreading
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Nov 21­10:25 AM
Divergent Boundaries
mid
ocean
ridge
Example: ________ _____________ ______________
60,000 km
(about ___________________ long)
(37,000 miles)
Divergent Boundaries
• Ridge
Diverging
__________________ plates reduce surface pressure and magma
allows ______________ to more easily flow to the surface of Earth’s crust.
volcanic
large
There is a ___________ amount of _________________
activity
_______________ at underwater ridges
largely unseen
Nov 21­10:25 AM
Nov 21­10:25 AM
Divergent Boundaries
Divergent Boundaries
• Ridge
magma
As cool ocean water strikes the _______________ it forms
pillow
_____________ lava.
pillow
The ______________ lava cools and forms new crust
http://www.youtube.com/watch?v=hmMlspNoZMs&feature=related
Nov 21­10:25 AM
Nov 21­10:25 AM
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NOTES Divergent and Transform Boundaries.notebook
December 17, 2015
Divergent Boundaries
earthquakes
Shallow ______________ of low magnitude also form at divergent boundaries. older
Age of sea‐floor gets ____________ the further away from the ridge it is
0
Age of sea‐floor ranges from _____ at the ridge to subduction
~200
_________ million years old at the _____________ zone
Divergent Boundaries
Paleomagnetism
_________________________ is further evidence that the sea‐floor has spread over long periods of time.
polarity
The _______________ of Earth’s magnetic field has changed directions in the past.
700,000
Shows a record of reversing about every ____________ years.
Nov 21­10:25 AM
Nov 21­10:25 AM
Divergent Boundaries
Divergent Boundaries
• Rift Valleys
land
A diverging boundary that occurs on _____________ is rift
called a _________ drops
sinks
Land ___________ or __________
ocean
Can form ______________ basins
Nov 21­10:25 AM
Nov 21­10:25 AM
Divergent Boundaries
Divergent Boundaries
• Rift Valleys
Examples
low
Shallow, _________ magnitude earthquakes
Volcanoes possible (most divergent boundary volcanoes
• East African Rift
underwater
are _______________________) at mid-ocean ridges
Nov 21­10:25 AM
Nov 21­10:25 AM
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NOTES Divergent and Transform Boundaries.notebook
December 17, 2015
Transform Boundaries
Divergent Boundaries
Examples
slide
A place where two plates _____________ past each other in
opposite
• Rio Grande Rift
__________________ directions
Colorado to El Paso, TX
Along the Rio Grande River
Nov 21­10:25 AM
Transform Boundaries
Nov 21­10:25 AM
Transform Boundaries
powerful
• Shallow, _________________ earthquakes
No
• _______ volcanic activity
• Identifying features:
offset
____________ land features (i.e., orange grove trees)
offset
____________ mid‐ocean ridges
Nov 21­10:25 AM
Nov 21­10:25 AM
Transform Boundaries
San Andreas
• Example: _________ ____________ Fault, California
Nov 21­10:25 AM
Dec 9­3:20 PM
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NOTES Divergent and Transform Boundaries.notebook
December 17, 2015
Dec 9­3:20 PM
Dec 9­3:29 PM
Dec 9­3:26 PM
Dec 9­3:29 PM
Identify the Boundaries
Nov 21­10:25 AM
Identify the Boundaries
Nov 21­10:25 AM
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NOTES Divergent and Transform Boundaries.notebook
Identify the Boundaries
Nov 21­10:25 AM
December 17, 2015
Identify the Boundaries
Nov 21­10:25 AM
Identify the Boundaries
Nov 21­10:25 AM
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