What is happening with the "lava" in lamp a? explain your response. what is happening with the "lava" in lamp b? explain your response. relate your observations of lava lamp b to mantle convection and plate tectonics. what does the heat source of the lava lamp represent in the earth? what does the lava represent in the earth? if the lava lamp had floating pieces of foam at the top, what would they do? what would these foam pieces represent on the earth?