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A presentation about Arêtes by Alice Bailey.

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  1. 1. ARETESBy Alice Bailey
  2. 2. WHAT IS AN ARETE? The definition of what an Arête is...A sharp, narrow ridge or spur commonly found above the snow – line in mountainous areas that have been sculpted by Glaciers. Arêtes form as the result of continued backward erosion of adjoining Corries (Cirques). Many landforms today including Corries, Tarns and U-Shaped Valleys were caused becausesharp, narrow ridge or spur commonly of snow and ice below. This crushed A of Glaciers expanding due to the weight found above the snowrocks belowin mountainous areas that have been sculpted by glaciers. landforms, line which as a result caused erosion, which over time formed these including Arêtes. Because they happen in mountainous terrains andof Arêtes form as the result of the continued backward erosion have been adjoining cirques. Glaciations, they occur very often in the Alps. subjected to The sharp crested ridge separates the two opposing valleys (Cirques) that were onceformally occupied by Alpine Glaciers. The reason that it has steep sides is because the unsupported rock has collapsed under pressure and by the continual weathering and erosion. Arêtes are what separate the Corries from each other.
  3. 3. CRIB GOCH - WALES An example of an Arête in the United Kingdom would be Crib Goch located inSnowdonia, Wales. The translation of Crib Goch to English is ‘Red Ridge’. It is 3,028 feetin height and currently stretches 213 feet. The ‘Knife Edge’ Arête of Crib Goch and thePyramidal Peaks of Snowdonia, are both as a result of Glaciations. Another example of anArête would be ‘Striding Edge’. Crib Goch is suggested to be one of the wettest places in the United Kingdomtoday. It has averaged around 4,473 millimetres of rainfall a year over the past 30 years.In the Winter months, it can be extremely dangerous to climb and walk due to strongwinds and snow. Its highest point is 923 metres high and has some very steepslopes, which can be fatal during later months of the year. Around the area of this Arêteis a steep scree slope which is also deemed dangerous; especially to people who strugglewith heights.
  4. 4. MAP AND PICTURES OF ‘CRIB GOCH IN WALES’ The back wall of the corrie either side will erode past each other , so much so that the land gets very narrow. After this process of erosion, a Knife Edge will form.
  5. 5. The Arête is usually always in a ‘C’ shape and the only part it does not go round is where the back-lip lyes. The Tarn is in the middle and the Arête will surround it as well as the Corrie. Arêtes can be formed when two Cirques (Corries) erode head wardstowards each other. This frequently ends up however as a Col, which is a saddle-shaped pass. The edge of the Arête after this is then sharpened by Freeze-Thawweathering.
  6. 6. THANK YOU FOR LISTENING... ANY QUESTIONS?I hope you enjoy the quiz I have based on Crib Goch and Arêtes in general.