Ice shelves that exceed the coastlines grow out into the surrounding oceans. These shelves can be a mile thick and two and 1/2 miles deep.
Only 2% of its land is visible as mountain peaks and along the coastline.
An iceberg is a floating mass of freshwater ice that has broken from the outside edge of a glacier or a polar ice sheet. The expression the tip of the iceberg comes from the fact that about 1/10 of an iceberg is exposed. Most of it is still beneath the water. More than 90% of the earth’s ice is in Antarctica.
