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
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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/