Plot3D[Sin[t]Sin[s],{s,0,Pi},{t,0,Pi},PlotPoints®{40,40}]
Plot3D[Sin[t]Sin[2 s],{s,0,Pi},{t,0,Pi},PlotPoints®{40,40}]
Plot3D[Sin[2t]Sin[2 s],{s,0,Pi},{t,0,Pi},PlotPoints®{40,40}]
Plot3D[Sin[2 t]Sin[3 s],{s,0,Pi},{t,0,Pi},PlotPoints®{40,40}]

 …SurfaceGraphics…

 …SurfaceGraphics…

 …SurfaceGraphics…

 …SurfaceGraphics…