Pacific Ocean closed loop of the andesite line are most of the deep troughs, submerged volcanic mountains, and oceanic volcanic islands that characterize the Pacific basin. Here basaltic lavas gently flow out of rifts to build huge dome-shaped volcanic mountains whose eroded summits form island arcs, chains, and clusters. Outside the andesite line, volcanism is of the explosive type, and the Pacific Ring of Fire is the world's foremost belt of explosive volcanism. The Ring of Fire is named after the several hundred active volcanoes that sit above the various subduction zones. The Pacific Ocean is the only ocean which is almost
Ring of Fire (Northern Ontario) of about "1.5 million hectares". Although the Ring of Fire crescent covers 5,000 square kilometres (approximately 1,930 square miles), most discoveries made by 2012 were within a twenty-kilometre-long strip. Ontario's Minister of Northern Development, Mines and Forestry Michael Gravelle called the region "home to one of the most promising mineral development opportunities in Ontario in more than a century". Tony Clement, Canada's Treasury Board President and the FedNor minister responsible for the Ring of Fire, claimed it will be the economic equivalent of the Athabasca oil sands, with a potential of generating $120 billion. Clement says the Ring of Fire