Why does a drop of water or oil spread over the surface of a wooden table, while a drop of mercury takes an almost spherical shape?

A drop of water or oil spreads over the surface of the wood. the forces of attraction between the molecules of a liquid and a solid are greater than the forces of attraction between the molecules of the liquid itself, and the liquid wets the solid. A drop of mercury takes an almost spherical shape and does not spread, because the forces of attraction between the molecules of a liquid are greater than the forces of attraction between the molecules of a liquid and a solid, and the liquid does not wet the solid.