Download Convergent Boundary

Plate Tectonics
Plate Boundaries
Heat Transfer
Three types1. Conduction
2. Radiation
3. Convection
Heat transfer
1. Conduction – heat energy transfer between objects
by direct contact; touching (solid)
2. Radiation – heat energy transfer through space
(‘air’); in the form of ‘short waves’
3. Convection – heat energy transfer by movement of
air or a ‘fluid’ by circular movement of “convection
currents”
Convection Currents
Convection Currents in the Mantle
Convection Currents –
within the asthenosphere
(and perhaps the upper
mantle), convection
currents are the driving
force of plate movement.
Convection Currents in the Mantle
Forces Between Plates
• Tension – two plates pulling apart
• Compression – two plates pressing into each
other
• Shearing - two plates sliding/grinding past
each other.
Plate Boundaries
(divergent boundary)
TENSION FORCE: Divergent boundary
Two plates moving away from each other creating
new crust
 within oceanic area – sea floor spreading
 within continental area – rift valley
Plate Boundaries
TENSION: Divergent boundaries
Within an ocean – Mid-Ocean Ridge
Within a continent – African Rift,
aka Red Sea
Progression of a
Divergent Boundary
Plate Boundaries
COMPRESSION:
Convergent Boundary
Two plates moving toward each other;
the behavior/results depend on the
type of crust…
Plate Boundaries
(convergent boundary)
Ocean – Continent convergent boundary – subduction
zone (destruction of crust), volcanic mountain chain
Plate Boundaries
(convergent boundary)
Continent – Continent convergent boundary construction (yes construction) of crust, mountains
Plate Boundaries
(convergent boundary)
Ocean – Ocean convergent boundary – subduction
zone, (destruction of crust), volcanic island arc
Plate Boundaries
(Transform Boundary)
Transform boundary Shearing
• Two plates sliding /
grinding past each
other
Plate Boundaries
(Transform Boundary)
Plate Boundaries
(Transform Boundary)