The Staggering Numbers Behind Earth's Greatest Freshwater System S. Environmental Protection Agency. They contain 21% of the ...
Lake Erie is the shallowest of the Great Lakes with an average depth of 62 feet, but it is also the most biologically productive. All of the Great Lakes rank among the 15 largest lakes in the world ...
Three of the Great Lakes are below their long-term averages through July, according to recent data, but the lower lakes, Erie and Ontario, are showing higher water levels than average. "Despite ...