Section 1B

• The rigid lithosphere and crust is broken into many large and smaller tectonic plates
• convection currents should be used as a process for all plate boundaries
• tectonic plates move apart at divergent plate boundaries
• tectonic plates move towards each other at convergent plate boundaries
• plate move parallel to each other (in either the same or opposite directions, and at varying speeds) at conservative plate boundaries
• features of divergent plate boundaries:

  • mid ocean ridges
  • pillow lavas
  • transform faults
  • black smokers
  • rift zones
  • graben
• there are 3 different types of convergent plate boundary:

  • oceanic - continental
  • continental - continental
  • oceanic - oceanic
• features of oceanic - continental convergent plate boundaries:

  • asymmetric trenches
  • plutons
  • fold mountains
  • Benioff Zone
  • earthquakes
  • strato volcanoes
• features of oceanic - oceanic convergent plate boundaries:

  • asymmetric trenches
  • island arcs
• features of continental - continental convergent plate boundaries:

  • fold mountains
  • strong earthquakes
• processes at convergent plate boundaries:

  • convection currents
  • subduction

  (only at oceanic-continental and oceanic-oceanic convergent plate boundaries)
• features of conservative plate boundaries:

  • earthquakes
  • fault lines
  • modified river courses and drainage
• processes at conservative plate boundaries:

  • convection currents
  • shearing motion of plates leading to frictional resistance