How was the Baltic sea created?

Answer 1

The Baltic Sea was formed during the last Ice Age, approximately 10,000 years ago, when retreating glaciers carved out the landscape of northern Europe. As the glaciers melted, they filled the depressions with water, creating a series of glacial lakes that eventually connected to the North Sea. Over time, the sea's salinity evolved due to the mixing of freshwater from rivers and saltwater from the North Sea. Geological processes and post-glacial rebound have further shaped its current form.