Jump to navigation Jump to search This article is about the English Lakes – North Western area 1 : 25 000 PDF Great Lakes of North America. For the African Great Lakes, see African Great Lakes. Terra MODIS image of the Great Lakes, January 27, 2005, showing ice beginning to build up around the shores of each of the lakes, with snow on the ground.
Författare: Ordnance Survey.
The Great Lakes began to form at the end of the last glacial period around 14,000 years ago, as retreating ice sheets exposed the basins they had carved into the land which then filled with meltwater. The surrounding region is called the Great Lakes region, which includes the Great Lakes Megalopolis. A map of the Great Lakes Basin showing the five sub-basins within. Though the five lakes lie in separate basins, they form a single, naturally interconnected body of fresh water, within the Great Lakes Basin.
They form a chain connecting the east-central interior of North America to the Atlantic Ocean. Relative elevations, average depths, maximum depths, and volumes of the Great Lakes. All measurements at Low Water Datum. System profile of the Great Lakes. As the surfaces of Lakes Superior, Huron, Michigan, and Erie are all approximately the same elevation above sea level, while Lake Ontario is significantly lower, and because the Niagara Escarpment precludes all natural navigation, the four upper lakes are commonly called the „upper great lakes“.
This designation, however, is not universal. Detroit on the Detroit River links the region’s central metropolitan areas. The Chicago River and Calumet River systems connect the Great Lakes Basin to the Mississippi River System through man-made alterations and canals. Marys River, including the Soo Locks, connects Lake Superior to Lake Huron. Clair River connects Lake Huron to Lake St. The Detroit River connects Lake St.
The Niagara River, including Niagara Falls, connects Lake Erie to Lake Ontario. The Welland Canal, bypassing the Falls, connects Lake Erie to Lake Ontario. The Saint Lawrence River and the Saint Lawrence Seaway connect Lake Ontario to the Gulf of St. Lawrence, which connects to the Atlantic Ocean.
Huron, because they are one hydrological body of water connected by the Straits of Mackinac. Green Bay is an arm of Lake Michigan, located along the south coast of the Upper Peninsula of Michigan and the east coast of Wisconsin. Wisconsin Waterway and is part of a larger system of lakes in Wisconsin known as the Winnebago Pool. Grand Traverse Bay is an arm of Lake Michigan located on Michigan’s west coast, being one of the largest natural harbors in the Great Lakes. The bay has one large peninsula and one major island known as Power Island. Georgian Bay is an arm of Lake Huron, extending northeast from the lake entirely within Ontario.
Lake Nipissing, connected to Georgian Bay by the French River, contains two volcanic pipes, which are the Manitou Islands and Callander Bay. Clair, connected with Lake Huron to its north by the St. Clair River and with Lake Erie to its south by the Detroit River. Dispersed throughout the Great Lakes are approximately 35,000 islands. The largest among them is Manitoulin Island in Lake Huron, the largest island in any inland body of water in the world. The Great Lakes also have several peninsulas between them, including the Door Peninsula, the Peninsulas of Michigan, and the Ontario Peninsula. The Saint Lawrence Seaway and Great Lakes Waterway make the Great Lakes accessible to ocean-going vessels.
Pleasure boats can also enter or exit the Great Lakes by way of the Erie Canal and Hudson River in New York. Huron had remained fairly constant over the 20th century, but has nevertheless dropped more than 6 feet from the record high in 1986 to the low of 2013. Lake Erie From the Erie tribe, a shortened form of the Iroquoian word erielhonan „long tail“. This is enough water to cover the 48 contiguous U. Although the lakes contain a large percentage of the world’s fresh water, the Great Lakes supply only a small portion of U.
United Kingdom, and larger than the U. It has been estimated that the foundational geology that created the conditions shaping the present day upper Great Lakes was laid from 1. A notable modern phenomenon is the formation of ice volcanoes over the lakes during wintertime. Storm-generated waves carve the lakes‘ ice sheet and create conical mounds through the eruption of water and slush. The process is only well-documented in the Great Lakes, and has been credited with sparing the southern shorelines from worse rocky erosion. The most well-known winter effect of the Great Lakes on regional weather is the lake effect in snowfall, which is sometimes very localized. Even late in winter, the lakes often have no icepack in the middle.