Glacier Formation, Flow, and Earth Systems

Glacier Definition and Essential Characteristics

A glacier is a persistent body of natural ice that forms on land when snowfall accumulates faster than it is lost through melting, sublimation, or calving over many years. Under the influence of gravity and its own weight, the accumulated snow compacts into firn and then dense glacial ice, which slowly deforms and flows downhill. Glaciers are therefore dynamic geological formations rather than stationary masses of ice. Essential characteristics of glaciers include continuous movement, internal deformation, and the ability to erode and transport rock and sediment. Their movement creates distinctive features such as crevasses and seracs and produces landforms including cirques, moraines, valleys, and fjords. Glaciers originate on land, even when they flow into the sea, and are distinct from sea ice and lake ice. They also store a major portion of Earth's freshwater and are highly sensitive indicators of long-term climate change because their mass responds to changes in snowfall, temperature, and melting.

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Glacier Formation Through Snow Accumulation

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