Glaciers are a form of dense ice that is constantly moving because of its enormous weight. A glaciers speed is around 3 feet per day. Glaciers form over centuries of snow melting but not all the way and then icing over and that process repeating again and again creating large layers of ice.
Glaciers only form on land. Glaciers also Carve out deep crevices and create lakes as well as other land formations. Glaciers will also erode and pick up rocks and grind them away as the glaciers flow outward. 99 percent of all glaciers can be found at the polar regions. Glaciers account for about 10 percent of Earths land mass and have an average thickness of 7000 feet. Continental glacier cover around 5 Million square miles. Glaciers are considered to be one of the most sensitive indicator for global climate change. And are the largest source for rising sea levels.