- Being able to describe what the Baltic Sea is like as an ecosystem.
- Being able to identify organisms common to the Baltic Sea.
- Being able to describe the problems that threaten the Baltic Sea.
- The Baltic Sea is an inland sea.
- The water of the Baltic Sea is called brackish water. It is a mixture of saltwater and freshwater, and it has a low salt concentration.
- The organisms of the Baltic Sea are an unique combination of freshwater and saltwater species.
- The Baltic Sea is threatened by a number of problems. This is why the Baltic Sea must be protected.