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Glaciation - Coggle Diagram
Glaciation
Plucking
2.The weight of a glacier crushed the ground underneath, forming cracks.
- Plucking is the removal of rock from the ground by ice.
- When ice moves there is friction, which creates heat between the ice and the ground under it. (The heat then melts some of the ice).
- The meltwater tickles in the cracks in the ground.
- This water then refreezes around the rocks and sticks to the glacier.
- As the glacier moves forward, it ‘Plucks’ out chunks of rock and carries them with it.
Ice Ages
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The Ice Age to effect Ireland ended around 12,000 years ago.
During these periods, it was a lot colder than it is today. Snow fell in winter and did not melt in summer.
Year after year, layers of snow and ice built up until it was compressed together to form huge masses of ice called glaciers.
Valley Glaciers
12,000 years ago as the ice sheet melted, mountain valleys in Ireland were left with smaller ‘rivers of ice’ called valley glaciers.
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Abrasion
- The weight of a glacier crushed the ground underneath, forming cracks.
- As the glacier moves, the rocks attached to it scratch and scrape the ground. (Acting like sandpaper).
- They leave scratches in the rock called striae, or striations.
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- These can show us the direction in which the glacier moved.