PLATE TECTONICS by lL4X730

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									    PLATE
TECTONICS


    By: Ms. Susan
  Leonard-Balchak
                INDIANA
              STANDARDS
ES.2.7 Explain that the theory of plate tectonics
was finally accepted by the scientific community
        in the 1960’s when further evidence had
             accumulated evidence to support it.
Understand that the theory was seen to provide
 an explanation for a diverse array of seemingly
         unrelated phenomenon and there was a
     profound scientific explanation of how such
                          movement could occur.
  WHAT IS “PLATE TECTONICS?”
• The study of the “lithosphere:” the
  outer portion of the earth consisting of
  crust and mantle
• Lithosphere is divided into a dozen
  large “plates”
• Plates move and collide with one
  another creating mountain ranges,
  volcanoes, ocean trenches etc.
• Continents change through time as a
  result
• Known as “The Theory of Plate
  Tectonics”
THEOROIST: WEGENER
         • Studied rock types.
           glaciations, climate
           zones, and fossils
         • By this, he was able
           to “see” how
           continents must
           have been
           assembled in the
           geological past
               “Pangea:” Supercontinent
                                                 "Continental Drift"
                                                        1900
                                                Continental movement
                                                  Alfred Wegener

                 Pangea                       Theory of Plate Tectonics         Gelogical Time Scale
              Supercontinent                           1960's                       Fossils/rocks
      One Large Land mass originally          Accepted by geoscientists      Support plate tectonic theory
Certain areas were "weak" and would move   Adhered to continental movement      Assembles time line
  GEOLOGIC TIME SCALE
• Scientific way to
  sort Earth into
  specific time
  periods
• Based on
  rock/fossil
  assemblage
• These
  assemblages
  discern eras they
  were present
  Earth Processes for Tectonic
  Changes on Plate Boundaries

•VOLCANOES:        ABOVE AND
 BELOW WATER FORMATION

•EARTHQUAKES: ABOVE AND
 BELOW WATER FORMATION

•FOSSIL FUELS:       NEEDED FOR
 USE IN TODAY’S WORLD: FORMATION
     PLATE BOUNDARIES
• Convergent

• Divergent

• Transform

• Plate Boundary
  Zones
  VOCABULARY
FIND In groups of 2-3,
    link to below/find
definitions for boundaries



 http://pubs.usgs.gov/
 publications/text/unde
         rstanding.html
         CONVERGENT
         BOUNDARIES
• “Collision” of plates: (1) Ocean to
  Ocean and (2) Ocean to
  Continental
• (1)Subduction occurs (one plate slips
  under another) and ridges/volcanoes
  underwater are formed
• (2)Subduction occurs and mid-
  ocean ridges are formed
DIVERGENT BOUNDARIES
• Occurs where plates move apart
  and new crust is created from
  magma pushing up through the
  mantle.

• Causes sea floor spreading

• Hypothesized to further “break
  apart” existing continents
  LiST TWO BOUNDARIES
• TRANSFORM: Two        • PLATE BOUNDARY
  plates sliding past     ZONES: Any zone
  one another             that is not
  horizontally            explained in other
• Causes “fracture        processes
  zones”                • Plate deformation
• Connects 2              is seen
  spreading centers
• Found on the ocean
  floor
ASSIGNMENT:   DUE: 07/21/05

          • Define: Subduction
            zone, sea floor
            spreading, fracture
            zones
          • Sketch 4 types of
            boundaries and what
            earth process results
            from each (I.e.
            volcanoes)
          • http://www.ucmp.be
            rkeley.edu/geology/t
            ectonics.html.

								
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