The Theory of Plate tectonics:
Some information about Plate Tectonics is that PlateTectonics is probably the most important theory and the theory of global tectonics is that the lithosphere is devided into a bunch of crystal plates and each moves on too the plastic asthenosphere. When the lithosphere is broken into tectonic plates and the lithosphere plates ride on the asthenosphere and the tectonic plates are made of two types lithosphere: thicker continental and thin oceantic The upper part is called the crust. Than the tectonic plates are able to move because the earths lithosphere has a higher strenghth and lower thickness than the underlying asthenosphere.
Check out this awesome video of plate tectonics!