Compléter Great Lakes VocabularyVersion en ligne From the Ted Ed talk - What's So Great About the Great Lakes? par Elizabeth Curtiss 1 glaciers glaciers channels basins species natural species resources habitats invasive depth habitat 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 .
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