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Plate Boundaries

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1. Divergent Boundaries when two plates move away from ... These areas are usually associated with earthquake activity. Ex: San Andreas Fault in California ... – PowerPoint PPT presentation

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Title: Plate Boundaries


1
Plate Boundaries
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Aim What are the different types of plate
boundaries and what are the geologic activities
associated with these boundaries?
I. Plate Boundary where two or more
lithospheric plates meet.
A. Types of Plate Boundaries
1. Divergent Boundaries when two plates move
away from each other
a. As plates move apart, the asthenosphere rises
up and fills in the open space. It hardens and
forms new oceanic crust.
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b. Most divergent boundaries are found on the
ocean floor. Mid-ocean ridges are found at these
boundaries.
c. Rift valley narrow valley in the center of a
mid-ocean ridge formed as the plates separate.
GIF image 240x180 pixels
2. Convergent Boundaries the direct collision
of one plate with another plate.
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a. Continental Crust collides with Oceanic crust
(Subduction Zone) when a plate with oceanic
crust at its leading edge collides with a plate
with continental crust at its edge.
  • Because the ocean crust is denser, it is
    subducted (forced under) the less dense
    continental crust.
  • As a result of this, deep ocean trenches are
    formed and volcanic mountains are formed.

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b. Continental Crust collides with Continental
Crust
  • The colliding edges are crumpled and uplifted,
    producing large mountain ranges.

c. Oceanic crust colliding with oceanic crust
  • One plate subducts beneath the other creating
    trenches
  • Island arc chain of volcanic islands created
    from this type of collision.

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3. Transform Boundary forms where two plates
are grinding past each other.
  • These areas are usually associated with
    earthquake activity. Ex San Andreas Fault in
    California

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Convergent Plate Boundary
Divergent Plate Boundary
DPB ex 2
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Review Questions
Question 1 What are the three main types of
plate boundaries?
Marke was paying attention the whole lesson.
Please answer this for us.
Of course Marke. The three main types of plate
boundaries are divergent, convergent, and
transform.
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Question 2 What can be created due to
diverging plates?
Guy Balzo please share with us.
Youre the man Guy!!!! Like Guy said, because
most diverging plates are found in the ocean, new
ocean floor is being created. Undersea
volcanoes, rift valleys, and mid-ocean ridges can
also be formed due to diverging plate motion.
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Question 3 What happens when oceanic crust
collides (converges) with continental crust?
Anna!!!! Think about it we all know you can
answer this.
Yes. The oceanic (denser) plate will subduct
beneath the continental (less dense) crust. Nice
job Anna.
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