<human>:  When was the Great Salt Lake formed?
<bot>: The Great Salt Lake was formed about 10,000 years ago when the ice age ended. The lake formed as a result of water that had been trapped in a large basin during the ice age. The lake is about 10,000 square miles and it is the largest saltwater lake in North America. The lake is so salty that it is nearly impossible to drink. The water in the lake is so salty that it is actually denser than water on land.