HOW TO MAKE THE SKY MOVE/HOW TO SAVE A GIF:
Download images (make sure in timeline mode)
only have the 1 showing and add a frame (Square with little corner folded)
Show layers 1 and 2, add a clipping mask to 2
Color black with the paint brush tool in water area
Hold down "option" and drag clipping mask to layer 3
repeat these steps for layer 4
when you click play the sky should move but nothing else
to save got to file, export, save for web
choose the very top option
and for sizing type in 500 (or any size) and save
drag gif to a web browser and watch it play