Glaciers
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Glaciers are large bodies of dense ice that are constantly moving due to their own weight. As glaciers advance and retreat, they leave behind several landforms including rolling hills, moraines, eskers, drumlins, and kettle lakes. Glaciers form in areas where more snow accumulates than melts over many years or centuries.
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What are fluvioglacial processes?
Here is a 4 mark labelled sketch of an esker:
[SKETCH OF AN ESKER]:
- Sinuous ridge
- Coarse gravel and sand
- Stratified layers
- 5-20m high
Eskers form through the process of subglacial deposition:
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Landforms associated with Glacier
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Glaciers
Meaning and formation of glaciers along with their impact and interaction with the environment such as erosion, transportation and deposition.
Glaciers
1. Glaciers are thick masses of ice that slowly flow downhill under their own weight. They help shape landscapes through erosion and deposition. The two main types are valley glaciers and ice sheets. Greenland and Antarctica have massive ice sheets.
2. Glaciers move via plastic flow and basal sliding. They accumulate ice in the accumulation zone and lose ice in the ablation zone, through melting and calving of icebergs.
3. Glaciers erode bedrock through plucking and abrasion, grinding rock into fine flour-like sediment.
Glacier
Glaciers form from the recrystallization and compaction of snow. They exhibit variations in size, form, and origin. Glaciers erode the underlying landscape through abrasion, plucking, gouging, and sapping. They can form characteristic landforms during erosion like cirques, troughs, hanging valleys, and truncated spurs. Glaciers also deposit material in the form of moraines, tills, drumlins, and outwash plains.
Glacial Erosion
Comprehensive powerpoint on features of Glacial Erosion.
Introduction to Glaciers and Ice, plucking, abrasion and freeze-thaw, followed by descriptions and photographs of:
Corries
Aretes
Pyramidal Peaks
U-Shaped Valleys
Hanging Valleys
Truncated Spurs
Ribbon Lakes
Lesson 5 glacial features
This document provides information about glacial processes and landforms at different scales. It discusses factors that influence glacial erosion rates like ice thickness, precipitation, ablation rates, and bedrock permeability. Landforms formed include cirques, arêtes, pyramidal peaks, truncated spurs, U-shaped valleys, hanging valleys, and ribbon lakes at the macro scale. Meso scale features include whalebacks, roches moutonnées, and crag and tail formations. Micro features provide evidence of ice flow direction through striations, chatter marks, and crescentic gouges. The document emphasizes that landforms result from multiple glacial periods and different glacial processes of erosion, entrainment, transport, and deposition
Work on ice class 6
Glaciers form in areas where the amount of snowfall exceeds the amount of melting. They accumulate as snow and ice and take on the appearance of slow-moving frozen rivers across the landscape. As glaciers move downhill, they erode and carve the surrounding terrain, forming cirques, hollows, and depositing debris that builds up as moraines. Alpine glaciers in particular begin in bowl-shaped cirques high in the mountains before flowing downward, deeply carving the land and creating rugged landscapes through their erosive activity as they move.
Glaciation
Glaciation features such as corries, aretes, pyramidal peaks, glacial troughs, ribbon lakes, hanging valleys, truncated spurs, boulder clay/till, moraines and drumlins are formed by the glacial erosion processes of freeze-thaw weathering, abrasion, and plucking. Upland glaciated areas are used for farming, forestry, and tourism, but these human uses can cause conflicts over land management with environmental and social issues. Case studies of specific glaciated regions help explain these issues.
Glaceirs 2
Glaciers form where snow accumulation exceeds melting. They move via basal sliding and flow. Glaciers erode land into characteristic features like U-shaped valleys and cirques. They deposit unsorted sediment called till, forming moraines, outwash plains, and other landforms. Past glaciation scraped away soil over large areas, gouged out lake basins, and left moraines as ice sheets retreated. It lowered sea levels and flooded valleys, shaping present-day coastlines. Tillite rock records testify to even older glacial periods in Earth's deep past.
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Glaciers
- 1. Glaciers
- 2. Glaciers Glacier: A glacier is a body of dense ice that is constantly moving under its own weight. A glacier forms where the addition of snow is more than the loss of snow over many years, often centuries.
- 3. Glaciers As glaciers advance and retreat, they leave many structures: • Rolling hills • Moraines • Eskers • Drumlins • Kettle lakes
- 4. Rolling Hills Rolling hills: Eroded mountains from repeat glaciation.
- 5. Moraines Moraines: Deposits of rocks and gravel left behind.
- 6. Eskers Eskers: form when parts of the glacier melt. This meltwater flows in tunnels under the ice. The melting releases sand and gravel forming a winding river pattern.
- 7. Drumlins Drumlins: are small hills with a distinctive teardrop shape. They form when a glacier moves over moraines that had formed earlier. The tip of the drumlin points in the direction that the glacier was moving.
- 8. Kettle Lakes Kettle lakes: Large chunks of ice left behind form into lakes.
- 9. Coulee Coulee: forms when a very large amount of water washes across the landscape in a short amount of time, eroding a kind of canyon/valley.
- 10. Glacial Anomalies The 16,500-tonne (18,200- ton) boulder transported far from its mountainous place of origin by a rockslide then by a glacial sheet of ice between 10,000 to 30,000 years ago to its present-day location just west of the Town of Okotoks.