Structure of the Earth

Please define/ explain the significance of these in regards to plate tectonics:

1. Lithosphere: outer part of the earth consisting of crust and the mantle. This is what the plates are made out of, what moves.
2. Oceanic Plates: tectonic plates that are underneath the water, still moving, and made up of more sulphur than continental plates. This makes them less dense and easier to submerge under the continental plates.
3. Continental Plates: The tectonic plates that are above sea water. They are denser than oceanic ones.
4. Asthenosphere: This lays underneath the lithosphere, it consists of molten rock. This is what the lithosphere (tectonic plates) move on top of.
5. Convection currents: This is the process of the heat movement in the asthenosphere that generates the tectonic plates movement.