- Tuzo came up with the theory of Plate Tectonics: looked at Harry Hess's evidence of seafloor spreading and Alfred Wegener's theory of continental drift
- there are 5 main layers, from surface to center: lithosphere(crust) solid outermost layer, asthenosphere(upper part of the mantle)
- There are three types of plate boundary movements
- Convergent: boundary between two plates that are pushing together
- Divergent: boundary between two plates that are moving apart...CONSTRUCTIVE BOUNDARY
- Transform: boundary between two plates that are sliding past one another
- continental/oceanic is an example convergence subduction
- ring of fire is convergent subduction boundaries