Figure Q10.4 is a photograph of a graduated cylinder filled with four fluids. Starting with mercury on the bottom and going up, we have salt water, water, and vegetable oil. In addition, a solid object rests at the interface between each liquid. At the bottom is a steel ball bearing, next an egg, followed by a block of wood, and a table-tennis ball on top. 

(a) Rank these eight substances in terms of their densities from the highest to the lowest. 

(b) Which items have a specific gravity greater than 1? Less than 1?

Figure Q10.4