Why does the cold preserve him?
We put food in the freezer to help it keep longer. Freezing slows down the rotting process. Our home freezers aren't very cold though, and after six months or so, the frozen food eventually goes off - or begins to rot. But inside glaciers and in some very, very cold places where the temperature is really cold and the ice never melts, remains of plants and animals are preserved, sometimes for thousands of years.