This video shows how the earth looked at different points in it's history. (Showcases theory details)
This video talks about how the theory of plate tectonics came to be and what the theory says about earth.
The Continental Drift Theory states that all of the worlds continents used to be connected but are now drifting further and further apart.
Plate Tectonics is the theory that the outer layer of the earth is divided into different plates that move around.