Lesson 3
Plate
Boundaries
Prepared by: Mikee S. Luna
Plate
Boundaries
Plate boundaries
are found at the
edge of the
lithospheric plates.
Different types of
Plate boundaries
based on their
movements
Plate
boundaries
01
DIVERGENT
BOUNDARY
02
CONVERGENT
BOUNDARY
03
TRANSFORM
BOUNDARY
DIVERGENT BOUNDARY
A divergent boundary
occurs when two
tectonic plates move
away from each other.
DIVERGENT BOUNDARY
• Constructive
boundary
• Spreading
boundary
CONVERGENT BOUNDARY
Convergent plate
boundaries are
locations where
lithospheric plates are
moving towards one
another.
CONVERGENT BOUNDARY
• Destructive
boundary
TRANSFORM BOUNDARY
Transform boundaries
are where two of these
plates are sliding
alongside each other.
TRANSFORM BOUNDARY
• Conservative
boundary
CONVERGENT
DIVERGENT
TRANSFORM
CONVERGENT
DIVERGENT
TRANSFORM
Lesson 3.1
Convergent
Boundary
Prepared by: Mikee S. Luna
What is convergent plate boundary?
Convergent plate boundaries are locations
where lithospheric plates are moving towards
one another.
The process of convergence relies on
compressional stress, which squeezes or
pushes the two tectonic plates together.
Two different types of Plates
C O N T I N E N T A L
O C E A N I C
Plates in which most of the
crust-the top rock layer is
mostly land.
Plates that lie primarily
under the ocean.
C O N T I N E N T A L
O C E A N I C
C O N T I N E N T A L
O C E A N I C
less dense
denser
thicker
thinner
made of rocks similar
to granite
made of dark basalt
rock
granite
basalt
Different
Types of
Convergent
Boundaries
01
OCEANICOCEANIC
02
CONTINENTALCONTINENTAL
03
OCEANICCONTINENTAL
OceanicContinental
Occur when an oceanic
plate collides with a
continental plate.
SUBDUCTION
A geologic process in which one edge of one
lithospheric plate is forced below the edge of
another. The denser of the two plates sinks
beneath the other.
OceanicOceanic
When two oceanic plates
collide, the denser plate
sinks below the lighter plate.
OceanicOceanic
The older, denser, and
colder plate at an oceanicoceanic convergent
boundary will always
subduct into the mantle.
Continentalcontinental
Collision of two continental
plates.
It does not have a
subduction zone.
Lesson 3.2
Divergent and
Transform
Prepared by: Mikee S. Luna
Learning Objectives
•
Understand how divergent
and transform boundaries
are formed.
•
Realize the importance of
understanding divergent and
transform boundaries.
Divergent boundary
A divergent boundary occurs when two
tectonic plates move away from each
other.
Tensional stress operates between the
tectonic plates at a divergent boundary, which
causes the lithosphere at these locations to
stretch and pull apart.
Divergence occurs between only oceanic or
only continental plates, not one of each.
Transform boundary
Transform boundaries are where two of
these plates are sliding alongside each
other.
Transform boundary
Shear stress operates at transform boundaries,
which involves sliding motion.