
Click image to enlarge.
  Heat Drives the System: 
Transform Boundaries 
  At transform boundaries, neither plate is forced under the other. Instead, the plates slide along each other. The sliding motion is rarely smooth. Stresses build up and then are released?sometimes in the violent movement of an earthquake.
see image of globe with arrows on it.
    Convection Currents
    Mid-ocean Ridge
    Continental Crust
    Oceanic Crust
    Volcanoes
    Subduction Zone
    Lithosphere
    Asthenosphere