Download Warm up pg. 86 - Educator Pages

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 What
are the three different ways
tectonic plates can interact with one
 Is ocean floor closer to a ridge younger
or older than floor further away? Why?
 What two devices helped scientists map
the ocean floor?
 What is the deepest trench in the world
named? How deep is it?
Pg. 87
 Convection-
the movement of heat in a
circular fashion where hot matter is rising
and being replaced by cooler matter
 Denser matter sinks while less dense
 Thought to be the driving mechanism of
plate movements
 Flow only at a few cm per year
 An
uplifted ridge pushes the ocean plate
toward a trench at a subduction zone
(called ridge push)
 Horizontal movement at the top of a c.c.
creates a drag of the crust creating plate
 When the crust is pulled into a
subduction zone, it is known as slab pull
 How
do convection currents originate
and how large are they
 Are they permanent features or do they
 What causes divergent boundaries on
continents like the Great Rift Valley in
 Create
your own diagram showing the
convection processes in the mantle that
drive ridge push and slap pull. Be sure to
include a ridge, a trench and the correct
direction of convective flow. You will have
to label a diagram on your next test.