Fracking or hydraulic fracturing is a method utilized by oil and gas companies to increase production of oil or gas from a well that would otherwise exhibit a low flow rate usually due to the geologic rock formation being too dense to allow for the economic recovery of hydrocarbons.
The Vikings lived in Scandinavia (mainly Norway, Sweden and Denmark), and in Iceland. They ventured (and proliferated) as far as Italy and the Mediterranean, but more commonly sailed to Ireland, Northern France, England, and even North America. Norway, Sweden, Denmark.
This first raid is recorded in the Anglo-Saxon Chronicle. It was the start of a fierce struggle between English and Vikings. The English called the Viking invaders 'Danes' but they came from Norway as well as Denmark. Norwegian Vikings or 'Norse' sailed to Scotland, where they made settlements in the north and on the Orkney and Shetland islands. Vikings also settled on the Isle of Man. Vikings raided Wales, but few made homes there.