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.
Viking attack on the monastery at Lindisfarne in AD 793. Just as Christian Europe had settled down after the barbarian invasions, followed by the onslaught of Islamic armies, a new wave of barbarian invaders came from the north in the form of the Vikings. These raiders came from the countries we now call Sweden, Denmark, and Norway. The Norsemen (North Men) were skilled craftsmen, navigators and sailors. Viking longships were capable of sailing seas and oceans, as well as maneuvering in very shallow rivers and streams.