The Canadian Shield is the largest landform region in Canada; it covers most of Canada and much of the United States. This region contains some of the oldest rocks in the world (3.96 billion years old).he Canadian Shield is the largest landform region in Canada; it covers most of Canada and much of the United States. This region contains some of the oldest rocks in the world (3.96 billion years old).
In the U.S., the half keg is considered as the most accepted size. The diameter of this keg ranges from 16.6 inches to 17.16 inches. In terms of height, the standard is 23.3 inches. It can hold as much as 15.5 gallons of liquid. When empty, it measures 29.7 pounds or 13.5 kilograms.
In European countries where the metric system is used, kegs come in 25 and 50 liters as a standard. It is common to refer to the size not in liters but in beers. The standard beer size is .5 liters so a 50-liter keg would be 100 beers. However, beer kegs can come in many sizes: