Thanks to the pioneering work of researchers such as William Smith, geologists in the early 1800s were able to swiftly organize rock formations into a single colossal record of Earth's history. Many geologists saw in this record a stormy epic, one in which our planet had been convulsed repeatedly by abrupt changes.
In European countries, the capacity of the common keg size is 13.21 gallons. It stands 20.94 inches high, the diameter of which is 16.06 inches. Aside from this, the next keg size has a capacity of 7.93 gallons. It has the same diameter as the 13.21-gallon keg, but it has a slightly lower height of 14.37 inches.
Another type of mini keg is the beer ball, a disposable plastic ball that usually holds around 5.2 gallons, roughly the equivalent of fifty five twelve-ounce beers, though they can also be found in a smaller, 3.8 gallon size. Like kegs, it is necessary to tap the ball before the beer inside it can be served.