how the great lakes were formed video

How did the Great Lakes were formed?

During the last ice age, the mile-thick Laurentide ice sheet covered most of Canada and the northern contiguous United States. … About 20,000 years ago, the climate warmed and the ice sheet retreated. Water from the melting glacier filled the basins , forming the Great Lakes.

How the Great Lakes was formed video?

How did the Great Lakes get so deep into the rock?

Molten magma below the highlands of what is now Lake Superior spewed out to its sides, causing the highlands to sink and form a mammoth rock basin that would one day hold Lake Superior. Eventually the fracture stabilized and, over time, the rock tilted down from north to south.

How were the Great Lakes carved out?

Simply put, the Great Lakes were created by glaciers. About 18,000 years ago, the Laurentide glacier covered most of Canada and the Northern U.S. As the glacier moved, it flattened mountains and carved valleys. … As it melted, water filled the huge holes carved by the glacier.

When did Lake Superior form?

1.1 to 1.2 billion years ago
Lake Superior has its origins in the North American Mid-Continent Rift of 1.1 to 1.2 billion years ago, which produced a huge plume of hot mantle where the present lake sits. The crust tore apart, leaving an arc-shaped scar stretching form Kansas through Minnesota, then down to Michigan.

How does the water flow through the Great Lakes?

Water flows from Lake Superior and Lake Michigan into Lake Huron; then through the Detroit River into Lake Erie; then through Niagara Falls into Lake Ontario; and then through the Saint Lawrence River to the Atlantic Ocean. Water also drains from the Chicago River on the south.

Are the Great Lakes connected naturally?

Though all of the lakes are naturally connected as a chain, water travel between the lakes was impeded for centuries by obstacles such as Niagara Falls and the rapids of the St. Marys River.

Why are the Great Lakes not salt water?

THE ANSWER: Lakes are fed by rivers, which in turn are fed by rainwater. … “The Great Lakes are not (noticeably) salty because water flows into them as well as out of them, carrying away the low concentrations of minerals in the water,” writes Michael Moore of Toronto.

How Lake Erie was formed?

The lake was gouged out by glacial ice between 1 million and 12,600 years ago. It was one of the first Great Lakes to be uncovered during the last retreat of the glacial ice. The oldest rocks from which the Lake Erie basin was carved are about 400 million years old and formed in a tropical ocean-reef environment.

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Which Great lake is the deepest?

Lake Superior
  • Not only is Lake Superior the largest of the Great Lakes, it also has the largest surface area of any freshwater lake in the world. …
  • With an average depth approaching 500 feet, Superior also is the coldest and deepest (1,332 feet) of the Great Lakes.

What did the Great Lakes look like before the ice age?

Before the Ice Age there were no great lakes, only shallow basins, except for Lake Superior which had originated aeons earlier as a rift valley lake in the Central North American Rift System. The river that drained this area, the Laurentian River, flowed through the Toronto area.

Where does the water from the Great Lakes eventually empty?

The flow of water in the Great Lakes system move from one lake to another eastward, ultimately flowing into the Atlantic Ocean.

How were the Great Lakes created text to speech?

The Great Lakes were created during the last Ice Age when the melting glaciers filled the holes that they had dug out over the years. A geographic area that includes all of the rivers and streams that flow into a lake or sea.

How did the Great Lakes form quizlet?

How were the Great Lakes formed? Glaciers cut out deep depressions and pushed ahead rock and soil. When they melted, the rock and soil piled up and blocked drainage. Then water eventually filled the lakes.

What Ice Age made the Great Lakes?

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.

how the great lakes were formed video
how the great lakes were formed video

Why does Lake Superior never give up her dead?

Lightfoot sings that “Superior, they said, never gives up her dead”. This is because of the unusually cold water, under 36 °F (2 °C) on average around 1970. Normally, bacteria decaying a sunken body will bloat it with gas, causing it to float to the surface after a few days.

Is there a volcano under Lake Superior?

Lake Superior Geology. These dark rocks, familiar around Lake Superior, are evidence of ancient volcanic activity. Called basalt, this volcanic rock is seen here at Temperance River State Park in Minnesota and can be found in all the state parks along Lake Superior’s Minnesota shore.

Are whales in Lake Superior?

Every year there are reports of whales in Lake Superior. The reports are sightings sent by residents and visitors along the north shore of Lake Superior. … In fact, humpback whales enjoy warm water, so Lake Superior isn’t necessarily ideal for that particular species.

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Who controls Great Lakes water?

The water in the Great Lakes is owned by the general public according to the Public Trust Doctrine. The Public Trust Doctrine is an international legal theory – it applies in both Canada and the United States, so it applies to the entirety of the Great Lakes.

Can you reach the ocean from the Great Lakes?

Yes, you can indeed sail from the Great Lakes to the ocean. In this case, the ocean you’d arrive at is the Atlantic Ocean. All five lakes connect to this ocean via the Saint Lawrence River. This river is also the Great Lakes Basin drainage outflow.

Are all 5 Great Lakes connected?

The five Great Lakes – Superior, Huron, Michigan, Erie and Ontario – span a total surface area of 94,600 square miles and are all connected by a variety of lakes and rivers, making them the largest freshwater system in the world.

Who discovered the Great Lakes?

While the area had been inhabited for a very long time before European explorers arrived, Étienne Brûlé (circa 1592-1632), an advance man for the French explorer Samuel de Champlain (circa 1567-1635), is generally credited as the first European to discover the Great Lakes.

Are there sharks in the Great Lakes?

Without the salt to process into their bodies, they simply cannot survive. One noteworthy exception is the bull shark. This shark specie has the capability to recycle salts through its kidneys and survive in freshwater surroundings. Therefore, bull sharks are the only potential shark that could live in the Great Lakes.

Can you get to the Mississippi River from the Great Lakes?

Yes you can and boaters, often called Loopers, do it year after year. There is a route called the Great Loop which extends from any of the Great Lakes and then follows Lake Michigan and then travels to and through one of many rivers like the Illinois and the Wabash which eventually take you to the Mississippi.

What are the biggest fish in the Great Lakes?

Lake sturgeon
Lake sturgeon are an awesome sight. The largest fish in the Great Lakes, they can grow to be nine feet long and weigh more than 300 pounds.

Why is the ocean blue?

The ocean is blue because water absorbs colors in the red part of the light spectrum. Like a filter, this leaves behind colors in the blue part of the light spectrum for us to see. The ocean may also take on green, red, or other hues as light bounces off of floating sediments and particles in the water.

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Is Niagara Falls saltwater or freshwater?

Our river is a young, freshwater system born of ice. But when the falls tore through this section of river 4,500 years ago, it exposed rock layers laid down as sediments in tropical, saltwater seas approximately 400 to 440 million years ago.

Is Lake Erie a dead lake?

During the 1960s, Lake Erie was declared a “dead lake” due to eutrophication and pollution.

What keeps Great Lakes full?

An extended period of excess evaporation that started in 1998 more than offset the added precipitation until the polar vortex event in early 2014 caused most of the lakes to freeze over. Since then, water supply has exceeded evaporation, partly because of several especially cold winters, Gronewold says.

Why does Lake Erie smell so bad?

Eastlake city officials later spoke with the Ohio Department of Natural Resources and learned the smell is caused by sediment churning at the bottom of Lake Erie, Mayor Dennis Morley said in another Facebook post.

Which Great Lake is the cleanest?

Lake Superior
Lake Superior is the largest, cleanest, and wildest of all the Great Lakes.

What is at the bottom of Lake Superior?

From satellite photos it has the shape of a giant ear. Speculations include a meteor crash site, ore deposit, mountain range, bomb site, alien space landing, underwater government base, an old mining dig, something military, or even a volcano…..500 feet under the surface of Lake Superior.

Does Lake Superior completely freeze over?

Ok, but does Lake Superior ever completely freeze over? Again, the answer is yes, but rarely. … According to the NOAA, the long-term average annual maximum ice coverage on Lake Superior is 61.5%, meaning that in a typical winter, the most ice coverage Lake Superior will see at one time is 61.5%.

What’s so great about the Great Lakes? – Cheri Dobbs and Jennifer Gabrys

Great Lakes

WORLD GEOGRAPHY 101: The Great Lakes


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