1. Tectonic Plate Boundaries

2. Divergent
EX: seafloor spreading, ocean basins
Two plates pulling apart from each other, allowing mantle to seep up and turn into new crust

3. Two plates sliding/grinding past one another
Transform
EX: Earthquakes, tsunami
Two plates sliding/grinding past one another

4. Two plates with equal density push up against each other
Convergent
EX: Mountain building
Two plates with equal density push up against each other

5. When a more dense plate subducts under a less dense plate
Convergent (subduction)
EX: Volcanoes
When a more dense plate subducts under a less dense plate