This lesson is a great lesson for a unit on oceans. It was created as a second grade lesson, but it can be used at any elementary level. This is part of a unit on oceans I created. If you were looking for a whole unit on oceans, I do have a unit plan available. However, if you were just looking for an introduction lesson to teach about oceans this is a great one.In order to use this lesson you will need to have the book What Is an Ocean? By Chris Arvetis & Carole Palmer. You can use the worksheet without the book by going over the answers with the students. (An answer key is provided).