powerpoint presentation

1. TYPES OF PLATE
BOUNDARIES
Ms. G. Martin

2. Plate boundaries are found at the edge of the
lithospheric plates. These are the areas where the two
plates meet, separate, or slide past each other. The
movement of the plates help explain several geological
events, such as volcanic activity, occurrence of
earthquakes, as well as formation of mountains, oceans
and continents.

3. Thermal convection – is the transfer of heat through fluid
liquid. It occurs when the intense heat from the core of the
Earth is transferred to the surface of the Earth through the
mantle.
Ridge push – is a force that comes from the heat expelled by
the magma that expands the lithosphere and asthenosphere
the ridge, pushing them above the surrounding floor.
Slab pull - is the force that the sinking edge of the plate
exerts on the rest of the plate.

4. A. Convergent Boundary
When two plates move toward each other, a convergent
boundary is formed. In this plate boundary, plates are colliding
with one another.
1. Collision between Two Continental Plates
When two continental plates collide, the rocks in
them are pushed upward that results to the formation of
mountains. A concrete example is when the landmasses of
and Asia collided millions of years ago that resulted to the
formation of Himalayan Ranges.

5. Collision of Two Continental Plates

6. 2. Collision between Two Oceanic
Plates
When two oceanic plates collide, the
denser plate dives under the other. An
example is subduction. It leads to the
melting of rocks in the mantle that trigger
the formation of volcanoes as the magma
rises beneath the surface.
Subduction also triggers the formation of
trench, a deep depression in the ocean
basin. Example are the Philippine Trench in
the east of the Philippines and the Java
Trench in south of Indonesia.

7. 3. Collision between an Oceanic
Plate and a Continental Plate
When an oceanic plate collides with
continental plate, the oceanic crust tends
be denser and thinner than the continental
crust, so the denser plate gets bent and
pulled under the lighter and thicker
continental crust. As the oceanic crust
a deep oceanic trench, or valley is formed
the edge of the continent.

8. B.Divergent Boundary
Divergent boundary occurs when
two plates move away from each other.
This is where the lithosphere pulled apart.
As the land stars to break apart, huge
cracks or valleys are formed. The
boundaries are symbolized in the oceanic
lithosphere by the rifts of the oceanic
system, including the East Pacific Rise, the
Mid-Altantic Ridge, and the continental
lithosphere by rift valleys such as the great
Rift Valley in East Africa.

9. C. Transform Boundary
The last type of boundary is one where the two plates slide
against each other in a sideways motion. In a transform
as the two plates slide past one another, neither plate is added to
nor destroyed at the boundary. This is the reason why transform
boundary is called conservative plate boundary. Massive
amounts of energy build up as a result of two massive plates
pushing against one another. Occasionally, this energy is released
suddenly in the form of large earthquakes. An example is the
famous San Andreas Fault in California, USA.

11. Thank You!