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.
Mini decks are the best skateboards for beginners who are 6-8 years old, between 3â5â and 4â4â tall who wear size 4-6 shoes. Mid-size Skateboard Deck width: 7.3â+ with an average deck length of 29â. For skaters 9 to 12 years old between 4â5â and 5â2â tall who wear size 7-8 shoes.