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Stormy Sea
Stormy Sea
Changing sea levels induce high tides and low tides. This picture shows the iratic effects this produces on the sea surface.
Copyright www.ens-newswire.com
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Malinbeg
Malinbeg
This photograph shows the raised beaches on the Donegal coast due to changing sea levels. Raised beaches may be marked as a distinctive bench-like feature along a slope. They represent the location of a former shoreline, now above sea level, and may be associated with distinctive washed stone, shell and sand mixes that are clearly shoreline deposits. One reason for the formation of raised beaches is because, during glaciations, the land surface is depressed under the pressure of ice. When the ice retreats, it takes time for the land to readjust, so that for a while the sea may be 'higher'. Later, the land may rise out of the sea, leaving the former shoreline 'high and dry'. This is technically known as an 'isostatic' rebound. A second reason for raised beaches is that as the ice melted, sea level rose generally. This is known as a eustatic change and resulted in generally higher sea-level for some thousands of years. In Ireland these sorts of adjustments took place at the end of the Ice Age. Raised beaches were created in the northern half of the island due to the release of ice pressure. Near Malin Head, in north Donegal, a 'late Midlandian' raised beach now lies nearly 20 metres above sea level. Further south, the raised beaches (where they can be identified) become closer in height to present sea sea level. While the north readjusted and rose, either little happened in the south or else there was some slight tilt from north to south. Here, while there are signs of raised beaches from an earlier time, the sea level rises associated with the most recent melting of ice have contributed to a 'flooded' coastline where the present shoreline is clearly well above that along which the landscape developed. At places like Portmagee in west Iveragh (Co. Kerry) or along parts of the south Cork coast, there is no 'wave-cut platform' : the land just slips into the sea or below the surface of a very wide river. In the words of Professor Frank Mitchell, writing about south-west Kerry, 'if modern sea levels were to drop by 100 metres.... a dramatic archipelago would appear'.
Copyright Beautiful Monde http://www.beautifulmonde.com.
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Slemish Mountain and the old iron ore factory
Slemish Mountain and the old iron ore factory
This photograph captures Slemish Mountain and the Old Iron Ore Factory. Slemish Mountain is an ancient volcanic plug on the Antrim Plateau.
Image Copyright Philip Blair.
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Map showing Shannon-Erne Waterway
Map showing Shannon-Erne Waterway
A map of the canals and waterways of Ireland showing the Shannon- Erne waterway, the Ballinamore and Ulster Canals
Courtesy of John B Cunningham
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Slieve Elva
Slieve Elva
An image of the Slieve Elva area in the Burren, Co. Clare.
Courtesy of Ordnance Survey Ireland
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Upper Lough Bray, near Dublin
Upper Lough Bray, near Dublin
Photo of Upper Lough Bray, near Dublin.
Courtesy of Andy B
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The Mountains of Mourne
The Mountains of Mourne
Photo taken from St Johns Point, Co. Down, showing the Mountains of Mourne.
Courtesy of www.wikipedia.org
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The Northern world in the 'recent' Ice Age.
The Northern world in the 'recent' Ice Age.
The Ice Age that affected Ireland over the last several hundred thousand years was part of a wider phenomenon. Ice sheets (shown in light blue) covered much of Europe, all of Canada and northern parts of what is now the United States. Parts of Alaska and northern Asia were too dry to have ice sheets. Separate ice caps covered the Alps and much of the Himalayas. Icy seas extended much further south than at present, affecting the area around Ireland in winter. Because so much water was locked up in ice masses, sea level was much lower than at present. This map has the North Pole the centre and views large parts of the northern hemisphere as if from above the Pole. Ireland appears near the top and slightly to the right of centre. The south coast of Ireland faces the top margin. Source of map: Hannes Grobe, Alfred Wegener Institute for Polar and Marine Research, as posted on Wikipedia, 9.11.06
Image courtesy of www.wikipedia.org
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The Twelve Bens of Connemara
The Twelve Bens of Connemara
The Twelve Bens or 'The Twelve Pins' of Connemara, refers to a mountain range on the West Coast of Ireland.
Courtesy of Simon Stewart
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Carrauntoohil, Co. Kerry
Carrauntoohil, Co. Kerry
Carrauntoohil, Co. Kerry, is the highest mountain in Ireland. This photograph was taken from Carrauntoohil and shows the surrounding landscape.
Courtesy of Carsten Clasohm.
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