• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

fluvioglacial and glacial variations

Extracts from this document...

Introduction

a)Distinguish between the terms net accumulation and net ablation Net accumulation and net ablation together make up the glacial budget. Net accumulation occurs at higher altitudes and therefore lower temperatures, meaning less melting of ice and a larger build up of snow. This area is called the zone of net accumulation. In the winter snow builds up to become nev(, compacted deeply frozen ice which over time becomes part of the glacier, therefore making the glacier bigger Net ablation is essentially the melting of glacier ice, which takes place in the zone of net ablation. This may take place through meltwater running down fluvio-glacial rivers, the calving of icebergs on coastal glaciers, which is happening to the greenland glacier at the moment, and sublimation where the ice directly evaporates without going through the transitional water stage. The zone of net ablation is usually at lower altitudes where the temperature is higher. ...read more.

Middle

They occur when a glacier begins to retreat, meaning the velocity of the ice drops and so material begins to be dragged along rather than moving with the glacier. Drumlins are mounds of glacial moraine which the glacier deposits whilst it is still moving. The glacier shapes the moraine leaving a steep sloping stoss end and a steeper sloping leeward end. This leaves a hill which is similar in shape to an upturned spoon. Kames look like circular mounds which are missing the tapered end of a drumlin. They are 10-20m high and can be up to 50m long. They occur at the edge of ice sheets where the glacier has melted away to leave the kame. Kames are not usually found close to each other. Drumlins however are usually found in clusters or 'baskets of eggs'. They are found at the base of glacial valleys as they are usually formed by valley glaciers. ...read more.

Conclusion

Outwash plains and ground moraine are another two features which can be hard to distinguish between in the field. Both are similar since both are features often not recognisable to the untrained eye due to their scale. Outwash plains are usually many square kilometres in area. They are formed when streams of melt water from a glacier deposit the material they are carrying onto the ground on a flat area. This moraine and till builds up making the area very fertile. Outwash plains are found in the Svalbard area of Norway. Ground moraine is very similar but is formed by moraine deposited by ice sheets rather than melt water streams. Areas of ground moraine are usually made of till and also create fertile land which is now popular for farming. Ground moraine is deposited over regions of land, such as East Anglia. In the field outwash plains may have streams crossing them and are generally flat. Ground moraines however create a gently rolling topography and may have features such as drumlins on the surface. ?? ?? ?? ?? ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Hydrology & Fluvial Geomorphology section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Hydrology & Fluvial Geomorphology essays

  1. Changes in the Cairngorms

    There is also a swimming pool and sauna alongside a golf course. Loch Morlich is also used to its full capacity. Many water sports take place here, these include, jet skiing, canoeing, and water skiing. There is also a sandbank which people use and call a 'beach'.

  2. To what extent are fluvio-glacial deposits and landforms distinctive?

    As well as the ice itself eroding the bedrock, the debris within the basal layer of the glacier also erodes. Evidence for this process includes the polished appearance and texture of the rock in post-glacial regions. These processes are dependent upon various factors.

  1. Free essay

    Movement of Ice Sheets during the last glacial advance in the UK

    This combined with any weathered rock collected in the Bergschrund will lead way to abrasion which will further deepen the hollow.

  2. Geography Coursework How Does Farming Change Between Bredon Hill and Birlingham? ...

    Mr Norster doing this test. An auger, meter stick and hole made by the auger. PH test The test will show the acidity of the soil at a particular area. List of equipment needed for his test is: * Beaker * Soil * Spatula * PH meter To do this

  1. Main features and landforms of glacial erosion.

    Roche Moutonnee: are outcrops of resistant bed rock with a gentle abraded slope on what would have been the upstream side of the ice (stoss slope) and a steep rougher slope on the downstream side (lee slope). The name is French and translates into English as 'sheep rocks', a good description of them when seen from a distance.

  2. Geography investigation - The River Skirfare located in the Littondale region in the Yorkshire ...

    This is just one example of the links that will be found. To understand this investigation in thorough detail it is important to understand both the erosional and transportation processes that occur within a river. These can be seen in diagrams on the next page.

  1. Do the Characteristics of a river change downstream?

    and the other to a bench (North Bank.) The reason for this was ensure that the rope was kept taught making the results more reliable. The measurement for the width of the River Wharfe was done by beginning at the start of the south bank where the water touched the ground and ending at the same place at the north bank.

  2. The Cairngorms, a mountain wilderness

    There is also a swimming pool and sauna alongside a golf course. Loch Morlich is also used to its full capacity. Many water sports take place here, these include, jet skiing, canoeing, and water skiing. There is also a sandbank which people use and call a 'beach'.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work