Rotate. Move one finger around the screen
Move. Move two fingers across the screen
Zoom. Place two fingers on the screen near each other. Spread them apart to zoom in, or move them toward each other to zoom out.
Rotate. Hold the left mouse button and move the mouse
Move. While holding down 'Ctrl' or 'Shift', hold the left mouse button and move the mouse
Zoom. Roll the scroll wheel forward to zoom in, or backwards to zoom out.