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Three Types of Plate
Boundaries
Divergent
Convergent
Transform or strike/slip
Plates interact where they
meet.
Divergent boundaries—
Plates move apart
Example a spreading
center--Mid-Atlantic
Ridge
The Mid-Atlantic
Ridge goes through
Iceland.
Expeditions study unusual life
Or the Great Rift Valley
in Africa
Convergent boundaries
--plates move together
Three types of
Convergent Plate
Boundaries
oceanic –oceanic
oceanic-continental
continental-continental
Oceanic-oceanic
results in subduction of one plate
results in island arc volcanoes
Ocean-continental results in
subduction of the oceanic plate
Ocean-continental
Volcanoes form when
the oceanic plate
reaches the
lithosphere and begins
to melt
The less dense molten
material rises and
forms a volcano
Because it is a mixture
of basaltic oceanic
crust and granitic
continental crust, the
lava is Andesitic
continental-continental
Continental-continental
results in
enormous
mountains like
the
Himalayas.
Transform-fault boundaries-plates slide horizontally
Example--Pacific
plate and the
North American
plate slide past
each other at the
San Andreas
fault.
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