Every summer, we seem to gravitate toward ocean science projects and learning about the various ocean layers and animals .
My kids have always been fascinated by ocean animals -- probably because we hardly get to visit any large body of water :)
But this year, we'll be vacationing at the ocean!
So we are very excited and doing some fun learning activities before our trip.
Today's activity focuses on some under-the-sea science questions that will help your kids understand the five layers of the ocean, who lives there and how light travels -- and it's one amazingly beautiful project!
Layers of the Ocean: Under the Sea Science Activities
This is one of those crafty science projects that can be done with kids of all ages!
Younger kids will learn about the various layers of the ocean (since the ocean has 5 distinct zones) along with where marine animals live. Older kids can dive into some of the science of how far light travels in the ocean and a more in-depth look at how that impacts life in each ocean zone.
We've include details about how to construct your own ocean layers along with affiliate links to items you might need and some awesome books to read for this project!
You'll need a few items to create your own layer of the ocean:
• 5 small containers (we used glass spice jars from Trader Joe's) that will easily stack. If you don't have small jars, try using small round food storage containers with lids
• Food coloring (you'll need blue, red & green to make all 5 layers)
• Ocean creatures (we love the ones from Safari Ltd! Try the Safari Ltd Ocean TOOB which we used in our ocean jars and also the Safari Ltd. Deep Sea Creatures group which you could use for the deep ocean zones too.
• Paper & pen so you can label each ocean layer
Ocean Science: Who lives in which Ocean Layer?
Write out the names of the 5 Ocean Layers/Zones so you can use them to label your bottles:
If you're using any animal figures, be sure to put them into the containers first! Otherwise, you'll be having a quick discussion about water displacement if you drop them in after the bottles are filled :)
We only used Safari Ltd Ocean TOOB animals for our upper ocean layers since we were discussing how light travels and didn't want anything in the jars for the lower ocean when we were looking at this concept.
And yes, there is an octopus and eel in our midnight zone -- we chose to be creative! We learned that the Dumbo octopus lives there along with certain species of eels so we added them. Let your kids be creative with what they read & learn!
You can use one of these books to learn more about which marine animals live in the various ocean zones or layers:
Ocean: A Visual Encyclopedia is a beautiful book with gorgeous photos & facts for all types of ocean animals!
And we love Wish for a Fish: All About Sea Creatures as a resource for younger kids (it's part of the Cat in the Hat Learning library series)!
And for fans of Ms. Frizzle, try the Magic School Bus Presents: Sea Creatures: A Nonfiction Companion to the Original Magic School Bus Series ! This is a newer book that focuses on sea animals and pairs nicely with the original Magic School Bus on the Ocean Floor (which talked more about the ocean in general).
Once you've added your animals, fill each container with water and then add food coloring for each of your ocean zones.
Our containers used about 6 oz. of water so you may have to adjust your food coloring depending on how much water is added to your containers. We added the following drops of food coloring to each jar:
Sunlight Zone -- we touched a toothpick to the blue food coloring and then tipped it into the bottle
Twilight Zone -- 1 drop blue
Midnight Zone -- 2 drops blue
Abyss -- 4 drops blue
Trenches -- 5 drops blue, 2 drops green & 1 drop red
Now comes the cool part -- stack your containers!
I know -- one of those beautiful science crafts, right?!
Be sure to refer back to your books and reading about the types of animals that live in the various zones. When we made our Ocean in a Jar, it was very clear that most of the marine animals live in the Sunlight Zone, a few live in the Twilight Zone and as you progress deeper into the ocean, you find those layers are less populated.
AND the animals that live in the deeper layers have various adaptations that will allow them to thrive without light or a huge food source which is super interesting.
** I do want to note that some resources will only list 3 ocean zones (sunlight, twilight & midnight) -- they are including the abyss & trenches as part of the midnight layer of the ocean. I think that we probably should have made our midnight layer a little darker so less light would shown though our jar.
Ocean Science: How Light Travels in the Ocean
So let's talk about how light travels in the ocean.
The National Ocean Service has a great graphic & visual about how far light travels in the ocean! They only refer to 3 ocean layers as I described above -- but focus more on the depth that light reaches when it enters the water -- only about 1000 meters (or 3,280 feet)!
The science behind it: As light enters the water, light rays are refracted due to the density of the water. When light enters a more dense material, it slows down. As they light rays are refracted (or bent), they spread apart and are slowing down along with some of the rays being absobed by solid particles in the water.
This is why the ocean appears to have different colors of blue -- no because it is blue but because of the amount of light from the sun that reaches each ocean layer decreases as you travel deeper. And this is also why the majority of animals live in the upper layers as they need light (and some of them also need oxygen as they will come to the surface to breathe).
You can see in the photo above that we put a ruler behind our stacked ocean jars to get an idea of the light traveling through the water and how well you could see the ruler when looking through each jar.
ps. we also did this experiment outside but you could do it inside where less light would penetrate your ocean layers and also get a good idea of how light travels.
Here's a really close look at the ruler and how much you are able to see it through each of the ocean jars. It's much easier to see in the upper layers of our ocean and hardly visible in the lower layers.
Can't see it at all in the trenches but I promise, it's there! :)
MORE OCEAN ACTIVITIES FOR KIDS:
If you'd like to delve in deeper, here are some other excellent resources to use when learning about ocean layers and the animals that live in each one:
Prof. Noggin's Life in the Ocean -- these card decks are super fun and include themed trivia that kids of all ages will enjoy!
And if you're looking for a great visual experience, we highly recommend the Blue Planet: Seas of Life DVD set!
Plus these great hands-on activities --
And for more -- visit our Summer Printable Pack with more than 20+ full-color scavenger hunts, travel games & fun activities!