Canada has the 10th (nominal) or 15th-largest (PPP) economy in the world (measured in US dollars at market exchange rates), is one of the world's wealthiest nations, and is a member of the Organization for Economic Co-operation and Development (OECD) andGroup of Seven (G7). As with other developed nations, the Canadian economy is dominated by the service industry, which employs about three quarters of Canadians.[17] Canada is unusual among developed countries in the importance of the primary sector, with the logging and oil industries being two of Canada's most important. Canada also has a sizable manufacturing sector, based in Central Canada, with the automobile industryand aircraft industry being especially important. With a long coastline, Canada has the 8th largest commercial fishing and seafood industry in the world.[18][19]Canada is one of the global leaders of the entertainment software industry.[20]
Some of the most typical characteristics of groundwater are weak turbidity, a constant temperature and chemical composition and almost overall absence of oxygen. Circulating groundwater can have extreme variation in the composition with the appearance of pollutants and various contaminants.
