KArl quilligan plate tectonics powerpoint
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Transcript KArl quilligan plate tectonics powerpoint
PLATE TECTONICS
By: Karl
Quilligan
Map of U.S.A
SECTION 1
HISTORY OF PANGEA:
-Pangaea or “all Earth” existed until about 300 million
years ago during Carboniferous period
-Scientist & geologist Alfred Wegener developed idea of
Pangaea, he was ridiculed for his theory because they
didn’t have much proof about Pangaea
-Wegener was a meteorologist as well as a geophysicist
and won many awards in both backgrounds
-Arthur Holmes helped prove Wegener’s theory
Pangaea
Alfred Wegener
SECTION 2
Convergent Boundaries:
-an edge of a lithospheric plate tectonic,
usually at the edge of a continent
-Hazards of convergent boundaries are
avalanches, mudslides, landslides,
earthquakes, trenches, and volcanoes
-The Rockies in North America lie on the
North American and Juan de Fuca Plate
HAZARDS OF CONVERGENT
BOUNDARIES
Mudslide – downward
Landslide – falling/sliding of a movement of
mass of soil or rock down a
wet/saturated Earth
steep slope
Volcanoes – vent in
Earth’s crust through
which lava, ash, and
steam are expelled
Hazards of Convergent Boundaries
(cont.)
Mountains – natural
elevation abruptly rising
to a summit, larger than
a hill
Earthquakes – series of
vibrations that cause the
Earth’s crust to move and
or crack
Trenches (in black) –
long steep-sided
depression in the ocean
floor
Avalanche – mass of
snow and ice sliding
down a mountain
EARTH’S TECTONIC PLATES AND
MOVEMENTS
Boundary – where a plate ends or changes to another plate e.g. - end of North
American plate – start of Atlantic plate
Section 3
Divergent Boundaries – locations where plates are moving
away from each other, occurs above rising convection
currents
-Hazards include volcanic “leaks.” A volcanic leak is when
lava runs down hills; it doesn’t erupt, it just leaks. You also
have to be careful of rifts and rift valleys; they form from
two faults pulling apart
-Iceland is splitting right down the middle; it lies along the
Mid-Atlantic Range, a divergent boundary
Rift Valleys
Section 4
Transform boundary -
Transform Boundaries are locations where two
plates slide past one another. The fracture zone that forms a transform plate
boundary is known as a transform fault. Most transform faults are found in the
ocean basins
-Hazards are mainly earthquakes, mudslides, landslides, and avalanches
(depending on climate)
-A well-known transform fault/boundary is the San-Andreas fault on the west coast
of the U.S; it lies on the North American plate
Section 5
We live on the North American plate. All of the U.S (except
Hawaii) is located on this plate
The Cocos, Pacific, Eurasian, Caribbean, and African plates
border the North American plate
In Ohio, we are nowhere near the edge of a plate, therefore, we
don’t have to worry about any rifts, avalanches, earthquakes, or
volcanic activity. However, in places like California where they
have a fault, earthquakes can be a major problem.
In the near future, I don’t think any major disasters will happen,
(unless you believe in the 2012 apocalypse)
WORKS CITED
http://wiki.answers.com/Q/List_an_example_of_a_Convergent_Bound
ary_and_the_continental_plates_involved_in_that_boundary
http://media.maps.com/magellan/Images/tectonic.gif
http://geology.com/nsta/divergent-plate-boundaries.shtml
http://www.merriam-webster.com/dictionary/rift+valley
http://geology.com/nsta/transform-plate-boundaries.shtml
http://nagelbeelmanscience.wikispaces.com/