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Esjan
The mountain Esja () often called Esjan ("the Esja") is situated in the south-west of Iceland, about 10 km to the north of Iceland's capital city Reykjavík. Esja is not a single mountain, but a volcanic mountain range, made from basalt and tuff-stone.
==Formation==
Esja was built up at the end of the Pleistocene with the beginning of the Ice Age. During the warm periods, lava flowed and in the cold periods tuff-stone ridges were built under the glacier. The western part of the mountain range is the oldest (about 3.2 million years) and the eastern part is the youngest (about 1.8 million years). The movements of the plate boundaries cutting diagonally through Iceland are pushing the stratums to the west and away from the active volcanic zone. Intrusions, i.e. big magma channels coming from the old central volcanoes at ''Kjalarnes'' and ''Stardal'', introduced themselves into the stratums. Big lava fields were the result, one above the other, which the Ice Age glacier ground down. It left only the highest summits like the mountain range of Esja or Akrafjall.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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