OLogy




	Did you know that the ocean is made up of many different communities called ecosystems? All living things in an ecosystem depend on each other. There are many ecosystems in the ocean. Here, you can learn a lot about three of them — coral reefs, the continental shelf, and the deep sea. And you can learn about more ecosystems by collecting cards for the sea-floor, kelp forests, estuaries, polar seas, and mangrove forests.