A Closer Look at 10 Different Types of Valves. A list containing globes, gates, checks, angles and strainers can only mean weâre taking a closer look at different types of valves. In our discussion of the world of maritime supplies, a detailed listing of valves is a necessary procedure. 10 types of valves.
Canadian Shield. The Canadian Shield, also called the Laurentian Plateau, or Bouclier Canadien, is a large area of exposed Precambrian igneous and high-grade metamorphic rocks that forms the ancient geological core of the North American continent, covered by a thin layer of soil.he Canadian Shield, also called the Laurentian Plateau, or Bouclier Canadien, is a large area of exposed Precambrian igneous and high-grade metamorphic rocks that forms the ancient geological core of the North American continent, covered by a thin layer of soil.
Canadian Shield. The Canadian Shield refers to the exposed portion of the continental crust underlying North America. The Canadian Shield refers to the exposed portion of the continental crust underlying North America.The crust, also known as the North American Craton, consists of rock from the Archean and Proterozoic eons and extends from Mexico to Greenland.he Canadian Shield refers to the exposed portion of the continental crust underlying North America.