1.  What are the three different ways tectonic plates can interact with one another?  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?

2. Pg. 87

3.  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 rises  Thought to be the driving mechanism of plate movements  Flow only at a few cm per year

4.  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 motion  When the crust is pulled into a subduction zone, it is known as slab pull

6.  How do convection currents originate and how large are they  Are they permanent features or do they shift  What causes divergent boundaries on continents like the Great Rift Valley in Africa

8.  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.