Fill in the Blanks Great Lakes VocabularyOnline version From the Ted Ed talk - What's So Great About the Great Lakes? by Elizabeth Curtiss 1 habitat channels species habitats glaciers depth natural basins species invasive resources glaciers A long time ago , north America was covered in . As the melted away , they left behind deep that filled with water , becoming lakes . Because these lakes were created together , there are that connect them to each other . Lake Superior has the greatest , and because of this there are many of fish that live in the lake . Each of the lakes has a unique for fish and other animals . In recent years , have moved in and hurt these unique . Since we depend on the we get from these lakes , we must do what we can to protect them .