During the Late Archean Eon the Algoman orogeny – which occurred about 2,750 million years ago – added landmass through volcanic activity and continental collision along a boundary that stretches from present-day South Dakota, U.S., into the Sudbury, Ontario, Canada, region. The Great Lakes Basin (the Great Lakes and the surrounding area) began to form about two billion years ago, almost two-thirds the age of the earth.

Major cargoes include iron ore (and other mine products), iron and steel, agriculture, and manufactured goods. On June 26, 1954, a 10-foot, meteotsunami-caused wave swept fishermen off a pier on the shores of Lake Michigan in Chicago.

Note the Blue Draw Metagabbro (BDM), marked by the red dot, on the Wyoming province.The red dots show larger-magnitude earthquakes in Minnesota, Wisconsin, Michigan's Upper Peninsula and southern Ontario. Several earthquakes have been documented in Minnesota in the last 120 years,The Wawa subprovince is the wide green belt to the south; it is part of the Superior province. Cargo ships are aided by the system of canals and locks built on and between the lakes and rivers of the Great Lakes Basin.

Marquette Harbor Lighthouse on Lake Superior, Marquette, Michigan. Sportfishing is a very common activity, partly because of the Great Lakes' size, and also because the lakes are stocked year after year.

Some non-native species such as salmon and hybrid breeds have been introduced but have generally not succeeded. The lakes span across Canada and the United States.

Today, 200 million tons a year are transported using this waterway.

(Note that the map scales are different for these three maps.) Articles from Britannica Encyclopedias for elementary and high school students.

The seismic signals from the air gun array source were well recorded by the onshore stations up to distances of 250 km with a seismic trace spacing of 50–62.5 m. The GFTZ had a profound effect on the nature of the reflector patterns observed on the onshore seismic sections. More recently, about two million years ago, it was glaciers that advanced over and back across the land. It doesn't seem to work when the url is typed into Google.

1 on the map; it has three emplacements just northeast of Marquette. Estimates range from 7,000 to 32,000 years of age. He holds a master's degree in environmental management from Duke University.Biography of Robert Cavelier de la Salle, French ExplorerWar of 1812: Success on Lake Erie, Failure ElsewhereNational Parks in Michigan: Copper Mining and Maritime History

Spas and clinics are popular tourist attractions also, and a couple well with some of the serene waters of the Great Lakes. Earthquakes occurring in the Great Lakes region were thought to be in response to crustal rebound caused by the removal of ice from the last ice age. The ancient rocks of the

The end result of this is a loss of biodiversity.

The scientists are coming to believe that Lake Ontario and possibly Lake Erie lie on an extension of the well-known St.

revealed faulting in the south- eastern part of Lake Ontario.

Another major concern in the Great Lakes is non-native invasive species. An unanticipated introduction of such species can drastically alter evolved food chains and destroy local ecosystems.

Simplified tectonic map of Lake Superior region showing Great Lakes tectonic zone and adjacent Archean terranes S2 2.

Generalized geologic map of northwestern Michigan and Wisconsin, showing approximate trace of the Great Lakes tectonic zone S5 4.

On the Michigan-Wisconsin border are the Watersmeet Dome gneisses; they extend into Wisconsin.This shows a possible configuration for the attachment of the Wyoming and Superior provinces at 2,100 million years ago.

Interestingly, Lake Michigan and Lake Huron are connected by the Straits of Mackinac and can be technically considered a single lake.

15 on the map; it is bisected by the Morton complex.The Watersmeet Domes gneisses straddle the Wisconsin-Michigan border. Such measures have drastically improved the quality of water, though pollution still finds its way into the waters, primarily through agricultural runoff.

The size of the dot indicates the strength of the earthquake. 11 is a quartz monzonite-migmatite complex which also straddles the border; it is northwest of the Watersmeet Domes and has a southwesterly orientation.Marquette, Michigan, is on the eastern side of the map, on Lake Superior. An earthquake will strike in an area where earthquakes do not commonly occur.

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