All of the following shows density and buoyancy except:

A. ice cubes floating in a glass of iced tea

B. the amount of hot soup contained in a bowl

C. a hot air balloon moving through the air

D. a boulder resting at the bottom of the ocean

The answer is B. the amount of hot soup contained in a bowl. Buoyancy is defined as the upward force exerted by a fluid on an object immersed in that fluid. Buoyancy and density are two factors that affect the downward and upward forces exerted on object that affect its ability to "float" or "sink". Only B does not have anything to do with such forces.