The deposition of X and Y on ground surfaces is referred as wet and dry depositions, respectively. X and Y are :

Step-by-step solution

Wet deposition is the acidic water received through rain, fog, snow, dew, mist, etc. Dry deposition is deposition of wind blown acidic gases and particles on the ground. Ammonium salt in rain drop result in wet deposition. Oxides of Nitrogen and sulphur settle down on ground as dry deposition.