Sea Floor Spreading/Plate Tectonics

All questions from sections 1.1-1.5 are due on Tuesday, January 13th.
Questions from sections 1.1 - 1.3 may be found on earlier posts.

Sea-Floor Spreading

1. How does sea-floor spreading provide a way for continents to move?
2. What is the evidence for sea-floor spreading?
3. What happens at deep ocean trenches?
4. What is the Mid-Atlantic Ridge?

Plate Tectonics

1. What is the theory of plate tectonics?
2. What are the three types of plate boundaries and what are their characteristics?