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Describe and explain how isostasy has shaped the Irish landscape. - Leaving Cert Geography - Question 3B - 2020
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 - 2020
Step 1
Identify the impact/feature of isostasy
Answer
One major impact of isostasy on the Irish landscape is the emergence of coastal features. As the ice sheets from the last Ice Age melted, the weight that was pressing down on the Earth's crust was removed, leading to the gradual uplift of the land. This process has contributed to the formation of raised beaches and other coastal landforms, as the coastline has experienced significant changes in elevation.
Step 2
Description/Explanation of the coastal features
Answer
The uplift of the Irish landscape due to isostatic rebound has resulted in interesting coastal features. For instance, west of Ireland, raised beaches are evident, indicating where the coastline once was when sea levels were higher. Additionally, isostasy has contributed to coastal erosion, shaping cliffs and other landforms. This dynamic process reflects the balance between land and sea and highlights the ongoing geological changes in Ireland.
Step 3
Identify another impact of isostasy
Answer
Another significant impact of isostasy on the Irish landscape is the creation of glacial landforms. During the last glacial period, ice accumulation created depressions in the land. As the ice retreated, the land began to rise, leading to the formation of features such as drumlins and kettle holes.
Step 4
Description/Explanation of glacial landforms
Answer
Drumlins, which are oval-shaped hills formed from glacial sediment, are abundant in certain areas of Ireland, such as County Roscommon. As glaciers moved, they reshaped the underlying rock, and when they melted, the remaining sediment formed these characteristic hills. Additionally, kettle holes, which are depressions formed when large chunks of ice melted, contribute to the distinctiveness of the landscape, creating areas of biodiversity and unique ecosystems.