1. Describe the concept of plate tectonics, and how continental drift and seafloor spreading are related to it.5. Define the terms lithosphere and asthenosphere, and indicate where in the earth each is found.6. Explain how a subduction zone forms and what occurs at such a plate boundary.7. Describe how continent-continent convergence comes about, and what happens when it occurs.8. Briefly explain what is meant by the term hot spot, and how these help to determine rates and directions of plate movements.