Any part of an existing rock that is incorporated into a sedimentary layer or igneous intrusion is older than the sedimentary layer or intrusion into which it has been incorporated. What stratigraphic principle does this statement represent?

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. 

Iwould say d. eye contact and body language because you aren’t using any spoken communication. hope this : )

The answer is that they depend on rainfall for their crops to grow. hope this .