2. What is the difference between a glacier, an iceberg and an ice pack?

A glacier is a significant volume of ice and snow settled on the ground, especially in the mountains, caused by the compaction of snow.

An iceberg , or ice floe, is a large mass of floating ice that has broken off from a glacier or ice shelf. The icebergs are largely submerged, of which we can only see with the naked eye one eighth of its size, the so-called tip of the iceberg.

A pack ice , or sea ice, is a layer of floating ice that forms in polar ocean regions. Its typical thickness is one meter when it is renewed each year, which then increases between 4 to 6 meters, although on some occasions it can reach up to 20 meters or more.