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Describe and explain how isostasy has shaped the Irish landscape. - Leaving Cert Geography - Question 3B - 2022
Question 3B
Describe and explain how isostasy has shaped the Irish landscape.
Worked Solution & Example Answer:Describe and explain how isostasy has shaped the Irish landscape. - Leaving Cert Geography - Question 3B - 2022
Step 1
Impact / Feature identified: Glacial Rebound
Answer
Isostasy has led to the phenomenon of glacial rebound in Ireland. During the last Ice Age, the weight of ice sheets caused the land to sink. Now, as these ice sheets have melted, the land is slowly rising back to its original levels. This process has created a landscape that features uplifted areas, which can be observed in locations such as the Mourne Mountains in Northern Ireland.
Step 2
Description/Explanation of Glacial Rebound
Answer
The process of glacial rebound involves the adjustment of the Earth's crust to the removal of the overlying ice mass. As the weight of glaciers is removed, the crust begins to rise. In Ireland, this has resulted in the emergence of highland regions, which were previously depressed. The rebound can be measured in millimeters per year, showcasing a clear sign of the land's recovery. Additionally, the vegetation patterns are changing in response to the uplift, leading to the emergence of new ecosystems.
Step 3
Impact / Feature identified: Coastal Erosion
Answer
Another impact of isostasy affecting the Irish landscape is coastal erosion. As the land rises, it can impact sea levels locally, which in turn affects coastal areas. This process has been observed along the coast of counties such as Antrim, where rising land also contributes to dynamic changes in coastal erosion patterns.
Step 4
Description/Explanation of Coastal Erosion
Answer
Coastal erosion related to isostatic adjustment can lead to the retreat of cliffs and the reduction of land. When land rises, the relative sea level can drop, altering wave dynamics and leading to significant erosion in certain areas. Over time, this results in the reshaping of coastlines, and contributes to features such as sea stacks and other landforms. These changes are not only geographical but impact local ecosystems and human settlements.