For Earth Day, my class worked through an Oil Spill lesson. It's all over Pinterest and I knew my third graders would love it!
We read the book Oil Spill and look at photos from the National Geographic website. The kids were very concern about the animals and how they were cleaned up.
To complete our experiment, I filled containers halfway with water and poured a layer of vegetable oil over the top. I showed them that even if you try to mix the oil & water, they separate with the oil settling on top of the water.