The diagram illustrates a convection current produced when a block of ice is put into a beaker containing water at room temperature. Which row gives the correct comparison of the temperatures and densities at water points P and Q?
- Atemperature at P higher than at Q; density at P higher than at Q
- Btemperature at P higher than at Q; density at P lower than at Q
- Ctemperature at P lower than at Q; density at P higher than at Q
- Dtemperature at P lower than at Q; density at P lower than at Q