Transcript Plate Tectonics - NagelBeelmanScience

PLATE
TECTONICS
By Amy Jo Jarboe
HISTORY OF PANGAEA
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Alfred Wegener first thought
of the theory of Pangaea.
He believed that all the
continental land masses
were in a gigantic
supercontinent known as
Pangaea.
He made a book called The
Thermodynamics of the
Atmosphere.
He also studied volcanoes,
which really helped with his
theory of pangaea
Arthur Holmes invented a
theory around the same
http://www.ucmp.berkeley.edu/geology/te
time.
chist.html
HISTORY OF PANGAEA CONT.
The theory of a “super
continent was not
originally excepted by
scientists, but as they
researched more, they
realized it was quite
possible.
 Pangaea lasted during
the Permian and
through the Jurassic
period, when it
started to break up.
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http://www.ucmp.berkeley.edu/geology
/techist.html
HISTORY OF PANGAEA CONT.
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Pangaea is Greek for “All
Earth”
Eduard Suess helped
recognize Wegener’s
theory. He had
discovered that there had
once been a land bridge
connecting all the
continents except North
America.
He found a fossilized
plant, Glossopteris, found
in many countries, which
means that they were all
connected at some point,
proving Wegener’s
theory.
http://www.ucmp.berkeley.edu/geology/te
chist.html
CONVERGENT BOUNDARIES
Convergent
Boundaries are plates
moving in opposite
directions that meet.
One is pulled
underneath the other.
 Another term for a
boundary being pulled
underneath another is
subduction.
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http://www.ucmp.berkeley.edu/geology/te
chist.html
http://scign.jpl.nasa.gov/learn/plate2.htm
CONVERGENT BOUNDARIES
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You may find a
Convergent boundary
where there is a
volcano, a mountainlooking thing that sends
out lava and ash.
Another sign may be
Earthquakes, a bunch of
vibrations in the Earth’s
atmosphere.
A third sign is a land
slides, when soil and
other things fall down a
hill, or avalanches.
http://scign.jpl.nasa.gov/learn/plate2.htm
CONVERGENT BOUNDARIES
The Aleutian Trench
is a good example of
this.
 This is where the
Pacific Plate is getting
pulled under the
North American plate.
 A Trench is a deep
depression in the
ocean that is narrow
and very deep.
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http://scign.jpl.nasa.gov/learn/plate2.htm
DIVERGENT BOUNDARIES
Divergent
Boundaries- Adjacent
plates that are getting
pulled apart.
 They are also known
as spreading plates.
 The pulling apart
causes sea floor
spreading.
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http://scign.jpl.nasa.gov/learn/plate2.htm
DIVERGENT BOUNDARIES
You may find a
divergent boundary
where there is a mid
ocean ridge.
 . The divergent
boundary is most
likely underwater.
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http://scign.jpl.nasa.gov/learn/plate2.htm
DIVERGENT BOUNDARIES
The Mid Atlantic
Ridge is a good
example of this.
 To the North, it
divides the Eurasian
plate and the North
American plate.
 To the South it
separates the African
plate from the South
American plate.
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http://scign.jpl.nasa.gov/learn/plate2.htm
TRANSFORM BOUNDARIES
Transform boundaries
do have some
problems though.
 They cause mudslides,
where mud and other
debris goes down a
hill.
 All three types cause
mountains.
 A mountain is an
elevation on the
Earth’s crust.
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http://scign.jpl.nasa.gov/learn/plate2.ht
m
TRANSFORM BOUNDARIES
Transform Boundaries
are plates that slide
past each other.
 Boundaries are the
limits something can
move.
 Plates are large areas
in the lithosphere that
react to tectonic
movement.
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http://scign.jpl.nasa.gov/learn/plate2.htm
REAL WORLD CONNECTIONS
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We live on the North
American Plate.
The only one the USA is a
part of is the North
American Plate.
The ones near it are Juan
De Fuca, and the Pacific
Plate.
We, personally are not in
very much danger (from
earthquakes, etc.)
There are areas that are,
however.
Such as California, and
Pennsylvania, for example.
http://geology.com/plate-tectonics.shtml
http://www.dnr.state.oh.us/geosurvey/ht
ml/geo_f03/tabid/8307/Default.aspx
REAL WORLD CONNECTIONS
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In the very distant future,
I anticipate:
The U.S. will move. Not
very fast, but it will move.
We will collide with
another plate and cause
anything from an
earthquake, to a deep
ocean trench
The continents will grow
closer together, causing us
to possibly go through
another continental drift,
but in reverse.
http://www.dnr.state.oh.us/OhioGeologic
alSurvey/GeologyTopics/GeologicHazards
/tabid/7902/Default.aspx