Bring the Ocean to you:
Way back 30 years ago, when I was a child care center director I remember going to the Conference on the Young Years and learning how to do this fun craft with a 2 liter soda bottle called “Ocean in a Bottle”
Back then we didn’t have the internet and fun, creative ideas were usually found in magazines, books, at conferences and networking so when we found something good we shared with everyone we knew. Today all you have to do is go to your favorite search engine! (I know I am aging myself but the bottom line is that we have so many amazing resources right at our fingertips that we have no excuse for not offering our kids new learning experiences every day!
So if you can’t go to the Ocean, bring the ocean to you
You can start out by watching this Video on Youtube that actually presents this activity as a Science experiment that teaches why oil and water don’t mix.
and then here are a couple of variations I found for this project.
and this one on Activities for Kids