In your classroom library or on your bookshelf, be sure to have books about the ocean and books or stories about ocean animals and more for the children to explore and flip through.
Be sure to have some colorful (preferred) pictures and photos of the ocean or drawings of the ocean or sea.
Create an Ocean Flip Book:
You can find old magazine (National Geographic, Sport Fishing etc.) and cut out the various colorful pictures of ocean life, fish, whales, colorful fish etc.
You can then place these images etc into a binder or binder with protective sleeves to create these books that children can flip through and explore to learn about the different kinds of sea life, vegetation and creatures found in the ocean
Create an Ocean in a Bottle:
Create an ocean in a bottle using a simple water bottle, some blue food coloring etc. You can also add sand, small sea shells and other things. You can get all the details to create this fun learning activity as described here.