For some who study the Great Lakes, relative size is a defining factor, particularly with Lake Superior, which is the world's largest lake by surface area (aside from the much larger Caspian Sea—if you're willing to call it a lake).
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The Great Lakes could be considered a failed ocean. They are in a place where rifting started to create a new ocean, but it never got connected to the ocean system (and flooded), and that was still the case when the rifting eventually stopped. Those rifts were then further (much later) excavated by glaciers.
Lake Erie drains into Lake Ontario via the Niagara River.The entire system flows to the Atlantic Ocean via the St.Lawrence River. As it flows from its westernmost point in Duluth, Minnesota to the Atlantic Ocean, the waterway drops in elevation approximately 600 feet.
The Great Lakes could be considered a failed ocean. They are in a place where rifting started to create a new ocean, but it never got connected to the ocean system (and flooded), and that was still the case when the rifting eventually stopped.
Water flows downhill, and the ocean is at the bottom of the hill, right? But Great Salt Lake sits at the bottom of a closed basin. It's a terminal lake. The only way water can leave is through evaporation.
The Welland Canal lock system connects Lake Erie and Lake Ontario, enabling vessels to bypass Niagara Falls. And the St. Lawrence Seaway lock system has tamed the St. Lawrence River, enabling ships to sail from Lake Ontario to the Atlantic Ocean since 1959.
Lake Ladoga, Russian Ladozhskoye Ozero or Ladozhskoe Ozero, largest lake in Europe, located in northwestern Russia about 25 miles (40 km) east of St. Petersburg.
While there have been past “sightings,” most have turned out to be pranks or misidentifications. The reality is that the largest of the Great Lakes (Lake Superior and Michigan) are extremely deep lakes that are too cold for sharks.
True tides—changes in water level caused by the gravitational forces of the sun and moon—do occur in a semi-diurnal (twice daily) pattern on the Great Lakes. Studies indicate that the Great Lakes spring tide, the largest tides caused by the combined forces of the sun and moon, is less than five centimeters in height.
Even when the water temperature is in the 20's (°F), the lake does not freeze, due to the high salt content of the water; but icebergs have been ob- served floating on the lake's surface, formed from freshwater that flows into the lake from tributaries and freezes on the surface before it mixes with the brine.
During the 1960s, Lake Erie was declared a “dead lake” due to eutrophication and pollution. The children's book, The Lorax, written by Dr. Seuss, actually included the following line referring to fish: “They will walk on their fins and get woefully weary in search of some water that isn't so smeary.
Lake Superior's beaches are open and safe for swimming over 90% of the time, and the water is extremely clear, with an average underwater visibility of 8.3 m (27 ft).