The volcanic creation of the Canadian Shield took place during the Earthâs earliest geologic era, the Precambrian, which includes the earliest 80% of Earthâs existence. The Precambrian era ranges from about 5 billion to 570 million years ago.This process continues today in such places as Hawaii.he volcanic creation of the Canadian Shield took place during the Earthâs earliest geologic era, the Precambrian, which includes the earliest 80% of Earthâs existence. The Precambrian era ranges from about 5 billion to 570 million years ago.
608 STANDARD. The most common bearing size is the â608.â Characterized by an 8mm core, a 22mm outer diameter and a 7mm width, these bearings are the industry standard and match up with nearly every skate wheel out there. NON-STANDARD Of course, there are exceptions to every rule.
For skaters 9 to 12 years old between 4â5â and 5â2â tall who wear size 7-8 shoes. Decks 7.5â or larger Deck width: 7.5â³+ â Deck length: 29â+. For all skaters over age 13, taller than 5â3â with a shoe size of 9 and up.However, individual skating style will determine deck size for these decks:7.5â³ to 8â³ â Standard board for adult riders skating streets or doing more technical tricks. 8.0â³ to 8.25â³ â Skating pools, ramps and parks.idth â The average width of a skateboard deck is 7.5â³- 8.25â³. Width is influenced by the size of the rider and the type of riding. Bigger riders and those skating ramps and vert ramps typically prefer a wider deck.