We are familiar with the fact that ice (the solid state of water) floats. What do things float”? What is special about water so that it expands (becomes less dense) when it freezes? This curious property has profound implications from reducing heat loss of lakes and oceans in the winter, to the breaking down of mountains as porous rock (and road pavement) is cracked in freeze-thaw cycles. Glaciers are an extreme form of ice “breaking down of mountains”. What conditions are needed for Glacier formation and health? Where are most Glaciers and why? When glaciers end in the Ocean, large pieces break off to form Icebergs. Where is the threat of Icebergs to shipping greatest and where was the Titanic lost?