Kids hear a lot about ocean pollution, but it’s hard to picture until they try to clean it up themselves. In this ocean pollution activity, kids make a pretend oil spill and plastic mess in a bin of water, then test tools to get it out.
Spoiler: it’s a lot harder than it looks. That’s exactly the lesson, and it makes a great Earth Day or ocean unit science experiment.
How to Do the Ocean Pollution Activity
Ocean Pollution Science Experiment
Get the printableLarge clear bin
Water
Toy sea animals, shells and a toy boat
Vegetable oil and cocoa powder
Used coffee grounds
Plastic bag, cut into small pieces
Two clear cups for samples
Spoons, tongs, small nets
Cotton balls and sponges
Dish soap and a small brush
Coffee filters
Fill the ocean
Fill the bin with water and take a clean water sample in one cup.
Add ocean life
Add the sea animals, shells and boat.
Make an oil spill
Mix a little cocoa powder into vegetable oil and pour it on the water.
Add more pollution
Sprinkle in coffee grounds and the plastic bag pieces. Take a polluted water sample in the second cup.
Remove the trash
Kids use spoons, tongs and nets to pull out the plastic pieces.
Soak up the oil
Try cotton balls and sponges to soak up the oil.
Wash the animals
Use a drop of dish soap and a small brush to clean the oil off the animals.
Filter the water
Pour some water through a coffee filter and compare it to the clean and polluted samples.
Safety note
Cut the plastic bag into pieces yourself and keep them away from little ones who mouth things. Wipe up spilled oil right away so floors don’t get slippery.
What Kids Learn from This Experiment
Once the pollution is in the water, kids quickly see it never comes all the way out. Talk about:
- Why it’s so hard to clean oil off water and off animals.
- Which tools worked best, and which didn’t work at all.
- How plastic and trash end up in the ocean.
- Small things your family can do, like using less plastic and picking up litter.
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Turn this into a full ocean unit with our ocean animal studies.
The experiment printable includes
- Step-by-step experiment directions
- Prediction and observation recording sheets
- Discussion questions
- Instant PDF download, nothing is shipped
Perfect for
- Earth Day
- Ocean units
- Science centers
- Homeschool
- Ages 4 to 10
Ocean Pollution Activity FAQ
Mix a little cocoa powder into vegetable oil and pour it on top of the water.
Let kids test it. Cotton balls and sponges soak up some oil, but none of the tools get it all, which is the point of the lesson.
A drop of dish soap and a small brush works best.
About ages 4 to 10. Younger kids can help with tools while you talk about what they see.
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We love seeing these activities out in the wild: the lumpy letters, the snack breaks, the proud “I made a B!” moments. Leave a star rating, tell other parents what worked (and what totally didn’t), and add a photo of your setup if you’d like.
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