We watched and described how the waves looked.
How to make an ocean in a bottle
What you need:
An empty bottle with a lid
Vegetable oil or Baby oil
1. First fill the bottle up to 60% with water
2. Add 2/3 drops of blue food colouring and shake the bottle (make sure you put the lid on first).
You can also add a pinch of glitter at this point if you like.
3. Next, pour oil into the bottle, but do not fill it right to the top. Put the lid on tight.
4. Finally, put the bottle on it's side and move it to see the waves.