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Ice Erosion and Deposition

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by Jenna Johnson on 9 October 2012

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Transcript of Ice Erosion and Deposition

Hanging Valley When tributary glaciers won't cut as deeply the ice melts , these steep glacial ditches lead into the deeper main ditches and, leave hanging valleys. It’s during an ice age when glaciers move because of colder temperatures. Involving glaciers and moving ice, And a glacier that flows into a larger glacier. Glacier and Tributary Glacier When ice sheets break off flat pieces the walls of crevasses get weaker or chunks fall off the front of an ice sheet. The results are icebergs, bergy bits and crevasse wall breakaways. Calving Valley Glacier Sediment (the stuff that settles to the bottom of a liquid) made of a mixture of different grain sizes which are given away directly onto the subglacial landscape during basal melting. Moraine Unsorted till gave away from either along the sides (lateral moraine) or the ends of a removed glacier (end or terminal moraine); or the material below a retreating glacier (ground moraine). Cirque A deep-walled half circular basin in a mountain caused by glacial erosion Ablation zone The place of a glacier where more mass is lost by melting or evaporation than is given. Melt water lake Water from melted snow or ice Horn A peak thinned and eroded glacier by three or more glacial cirques Arête A knife-edged rock divide between two glacial cirques Crevasse A deep space in glacial ice Drumlins A smoothly rounded hill of layered glacial pressure Esker A ridge of gravel and sand drift, formed by streams under or in glacial ice Firn Snow that has passed through one summer melt season but is not yet glacial ice. Firn becomes glacial ice once it has not become able to pass through liquid water Glacial striations When erosion smooths away the glacier, striations will make grooves that are made in the ice from leaves or rocks. Ice sheet A large flat-topped sheet of ice that is attached to land along one side and floats in an ocean or lake. More ice is added from the flow of ice from land and is removed by calving and/or melting Kame An odd shaped hill or mound made of sand, gravel and till that adds up in a ditch on a retreating glacier, and is then deposited on the land surface with further melting of the glacier Kettle Lake A ditch formed after a closed block of ice melts Rock flour Fine particles of rock, silt, and clay formed by glaciers grinding rock against rock Tarn After melting, the central ditch of a former cirque may hold a tarn lake Truncated spurs Form when small valley glaciers merge with a single large valley glacier.

Valley glacier A stream of ice flowing down slope Erratic It is a rock fragment that was carried by glaciers and deposited some distance from its source By, Jenna Dinkins Ice Erosion and Deposition Thanks for watching!!! :D Till
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