It also briefly touched on its importance and impact on the environment on a global scale.
A soon as the body of ice becomes too dense and heavy to maintain its shape, it slowly starts to move and spread outwards in all directions. This article explores what a continental glacier is and how it forms. All forms of glaciers can be classified into two main categories, namely continental and alpine glaciers. Antarctica has the largest ice sheets in the world and comprises 90% of all ice.
Massive ice sheets covered much of North America and Europe during the Pleistocene time period. It allows for the formation of a glacier over a number of years.
Ice movement is dominated by the motion of glaciers, whose activity is determined by a number of processes.  The only current ice sheets are in Antarctica and Greenland; during the last glacial period at Last Glacial Maximum (LGM) the Laurentide Ice Sheet covered much of North America, the Weichselian ice sheet covered northern Europe and the Patagonian Ice Sheet covered southern South America. When enough layers accumulated above it, the pressure becomes so high that the large, dense ice crystals compress into glacier ice, with the little air left, becoming trapped inside the ice mass.
Valley glaciers are generally unaffected by wind erosion. Intergovernmental Panel on Climate Change, American Meteorological Society, Glossary of Meteorology, "Glossary of Important Terms in Glacial Geology", "Ice and Glaciers -The Water Cycle-USGS Water-Science School", "Warming of the Antarctic ice-sheet surface since the 1957 International Geophysical Year", Creative Commons Attribution 4.0 International License, "Scientists discovered massive hidden canyons in Antarctica that could spell bad news for the rest of the planet", United Nations Environment Programme: Global Outlook for Ice and Snow, http://www.nasa.gov/vision/earth/environment/ice_sheets.html, Intergovernmental Panel on Climate Change (IPCC), United Nations Framework Convention on Climate Change, Reducing emissions from deforestation and forest degradation, https://en.wikipedia.org/w/index.php?title=Ice_sheet&oldid=985445109, Creative Commons Attribution-ShareAlike License, This page was last edited on 26 October 2020, at 00:26. The weight of the fresh snow forces the layer below to recrystallize, forming larger grains while forcing out some of the air between them during this process. In size, they are larger than 19,000 square miles. Understanding of these processes is limited and there is no consensus on their magnitude."
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