Glaciers are land-based, perennial accumulations of ice that have a component of flow, either currently or in its history. Glaciers form erosional features usually associated with their zones of accumulation. Some of these form under the ice by abrasion or quarrying. Others form above the ice. Glaciers also form depositional features usually associated with their zones of wasting. These features are composed of till (ice-melt deposits) or of outwash (meltwater deposits). There are also other features that form in association with glacial deposits or in association with the Ice Ages or with the changes caused by Pleistocene glaciation

Russell J. Wernlund

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