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Action of a glacier
The document outlines the key concepts to be covered in a lesson on glaciation. It will define terms related to glaciers and ice sheets, describe the processes of glacial erosion, transportation, and deposition that shape the landscape. Students will learn about the landforms that result from glaciation, their significance, and conduct field work on local landforming processes. Key topics include cirques, arêtes, fjords, drumlins, eskers, moraines, and kettle lakes.
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Action of a glacier
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- 2. • By theend of the lesson, the learner should be able to: 1. Define the terms: ✓ Glaciation, ✓ Glaciers, ✓ Ice sheets, ✓ Ice caps and ✓ Icebergs. 2. Describe the processes of glacial; • Erosion, • Transportation and • Deposition in highland & lowland areas 3. Describe the formation of the resultant features. 4. Explain the significance of glaciation. 5. Carry out field work on the significant land-forming processes within the local environment. Vinnix Glaciation Monday, April 19,
- 3. • action ofmoving ice (glaciers) changing (sculpturing) the land surface thro’ ✓ erosion, ✓ transport and ✓ deposition. Vinnix Glaciation Monday, April 19,
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- 8. Hubbard Glacier isthe largest tidewater glacier in Alaska Vinnix Glaciation Monday, April 19,
- 9. firn from southcascade glacier, 80x magnified. Vinnix Glaciation Monday, April 19,
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- 14. The Baltoro Glacierin the Karakora Mountains, Pakistan. At 62 kilometres (39 mi) in length, it is one of the longest alpine glaciers on earth. Vinnix Glaciation Monday, April 19,
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- 22. 1. transverse crevasses- crevasses stretch across the glacier transverse. 2. marginal crevasses - extend downward from the edge of the glacier pointing up glacier. 3. longitudinal crevasses - this form parallel to flow where the glacier width is expanding. Vinnix Glaciation Monday, April 19,
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- 24. BASAL SLIP Vinnix Glaciation Monday,April 19,
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- 30. EROSIONAL FEATURES: 1. Highlandfeatures 2. Low land features Vinnix Glaciation Monday, April 19,
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- 33. • a steepsided hollow at the head of a glaciated valley or armchair- shaped depression on glaciated slopes of high mountains. • form when snow accumulates into a shallow depression on the side of a mountain and, frost action causes rocks to weaken (break) widening/deepening of the headwall of a corrie. • if cirque is subject to seasonal melting, the floor of the cirque most often form a tarn (small lake) Vinnix Glaciation Monday, April 19,
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- 35. • as theice moves, it plucks the rocks in the hollow, thus allowing more ice to collect in it. • a bergschrund may form between the back wall and the glacier in the depression. • debris in the ice also may abrade the bed surface. the basin will become deeper if it continues to become eroded by abrasion • eventually, the hollow may become a large bowl shape in the side of the mountain, with the back wall/headwall being eroded by plucking. • if the cirque is subject to seasonal melting, the floor of the cirque most often forms a tarn (small lake) Vinnix Glaciation Monday, April 19,
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- 41. Sognefjord, Norway VinnixGlaciation Monday, April 19,
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- 50. 1. gradient/slope -gentle slopes allow accumulation of large sheets of ice and subsequent deposition of fluvio-glacial material (materials deposited by melt water). 2. stagnation of glacier - pressure builds up at the base of glacier which in turn causes melting of the base. melt water carries n deposits materials underneath the ice. 3. friction - moving ice and the rock surface to deposition of the heavy materials underneath the ice. 4. weight of the glacier - heavy glaciers tend to be deposit load faster/more 5. amount of glacial drift - a glacier with a lot of sub glacial matter, make it too heavy hence deposition of load. Vinnix Glaciation Monday, April 19,
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- 61. Till. Till. Ice. Ice. Ice melts leavingbehind till mounds. Till. Till. Ice. Ice. Ice melts leaving behind till mounds. Vinnix Glaciation Monday, April 19,
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- 66. aerial image ofkettle lake in Alaska Vinnix Glaciation Monday, April 19,
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