Final answer:
Liquid R would represent the core of the Earth in the cylinder scenario if it has a higher density than Liquid Q, as higher density materials sink below lower density materials in a gravitational field.
Step-by-step explanation:
The liquid that will sink to the bottom of the cylinder and represent the core of the Earth would be the one with the higher density. Given that the Earth's core is composed of dense metallic substances mostly iron, with substantial quantities of nickel and sulfur, and the density in the mantle increases downward due to compression, it's logical to deduce that Liquid R, by analogy, would be the one to represent the core if it has a higher density than Liquid Q.
Without specific densities provided for Liquids Q and R, we must rely on the principle that the substance with the higher density will sink. This principle applies in any context where gravitational sorting occurs in fluids, and is the basis by which we infer the composition and behavior of the Earth's layers, including the transition from the slowly flowing mantle rock to the denser liquid outer core and the even denser solid inner core.