Describe how the tectonic plates move.
describe the layers of the earth and how they are different from each other.

Right below the rigid outer layer of the earth called the lithosphere, there lies dense molten rock and metal. Since this liquid is more dense then the lithosphere pieces itself, the earth's tectonic plates simply "float" atop this liquid. Movement is caused by the earth's core. As heat is carried from the core to the outer, cooler areas, a current starts to form (convection cell). This ultimately moves the plates. 

Bwould be my guess |-/ 

Mantle convection is the process that drives plate tectonics. the theory of plate tectonics states that the crust is divided into plates that float on the semi molten mantle below. the circular motion of the magma as it slowly rises and falls or move though convection cells drags the plates along causing them to move. the heat source in the lamp would represent the earth's core. the core is the source of energy that drives convection in the mantle. the lava represents molten magma under the earth's surface. if the lava lamp had floating pieces they would move as the circular motion of the lava in the lamp as it rises and falls would move them along the surface. these floating pieces would represent pieces of the earth's crust.