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The Baltic Sea is low innersea. In it's history there have been many lake and
sea perioids. It has been only 1500 years like it is nowdays so it's a young
sea. The short history limits the species which live near Baltic Sea. Species
are also different according to weather circumstances at the water int the
Baltic sea. Baltic Sea is a mixture of ocean and river water and brackish water.
It's content of salt is low comparing to other oceans. There are sea and innersea
species in the Baltic Sea. There are no currents in the Baltic Sea. The height
of surface is still changing because of winds and air pressure differences.
It's at it's highest in late fall and it's at its lowest in spring. This helps
the Baltic Sea to freeze in Winter. The hardness and form of the bedrock and the
effects from iceperiod have changed the coastline and its islands. Islands are
important places to live for sea birds. Finland and Sweden have the most of islands.
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