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Chapter 4 Section 3 – The Theory of Plate Tectonics
1) Two types of crust on earth: Continental and Oceanic
2) The 3 types of plate boundaries, the motion of the plates at each, what they
create and an example: (not a very good picture but this is in your comp book)
3) What is the force strong enough to move the plates? convection/convection
4) How and where does this happen?
Convection is the entire cycle of heating, rising, cooling, and sinking that
creates a current and is able to move the tectonic plates. It takes place in
the mantle in the asthenosphere.
5) What is a subduction zone and where do subduction zones occur?
Subduction is when two plate collide at a convergent boundary and one
sinks under the other and melts back into the mantle. This happens
because of density differences in the earth’s crust. The denser plate will
6) When 2 continental plates collide with no subduction what does it create?
7) When 1 continental and 1 oceanic plate collides and one subducts what does it
Volcanic Mountains
8) Review the characteristics of the Lithosphere and Asthenosphere.
 Lithosphere = Made up of the earth’s crust and upper mantle and
this layer is all solid.
 Asthenosphere = Part of the mantle, plastic like (semi-liquid),
tectonic plates float on this layer.