Plate Tectonics

Plate tectonics describes the movement of the Earths lithosphere. Which relates to the theory of continental drift. The upper part of the lithosphere is called the crust, and the bottom part is called the mantle. There are three types of plate tectonics. One is called divergent which is were the earths crust pulls apart. When this happens in the ocean it forms a mid ocean ridge. Convergent is where the earth comes together. If this happens in the ocean it will form a trench, and if it happens on earth it will form mountains. The third type of plate tectonic is called transform, and its where the earths crust slides past each other.