Asystem of converging, relatively dry air that slowly descends, it warms by compression. this subsiding air produces generally clear skies and warm surface temperatures; hence, on earth it is here that we find the major deserts of the world, such as the sahara of africa and the sonoran of north america :
(a) inter tropical convergence zone
(b) subtropical high
(c) polar easterlies
(d) se trade winds

A I’m pretty sure and if not that I would say d

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.