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Well..I learned this in School.

The Great Lakes are the result of glacial scour and pooling of meltwater at the rim of the receding ice. When the enormous mass of the continental ice sheet retreated, the Great Lakes began gradually moving south due to isostatic rebound of the north shore. Niagara falls is also a product of the glaciation, as is the course of the Ohio River, which largely supplanted the prior Teays river.

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13y ago
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11y ago

the lakes were even larger than they are today because of the enormous volume of water from the melting glaciers. They eventually shrank to their present size as much of the glacialmelt waterdrained into the ocean.

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Q: Why are the five great lakes of Ontario and the four main lakes in Manitoba smaller than they were in the glacial period?
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Related questions

What is the name commonly use as a synonym for the Ice Age?

cold period, glacial period


When did the last glacial period end?

It is recorded that the last glacial period ended in 10,500 BC. That was supposedly the end of what is commonly known as the "Ice Age."


What happens to global sea level during a glacial period?

Sea levels drop globally during a glacial period as seawater is taken up in the ice sheets.


When was the end of the last glacial period?

10000 yrs ago


Is Pleistocene epoch is the only glacial period for which evidence exists?

no


What is the glacial period of history?

A glacial period is like the time of ice ages, when the most of the earth is covered in ice and snow.


What phenomenon left the Tasmanian aborigines isolated from the mainland?

the last glacial period


What happens during isostatic rebound?

Post-glacial rebound (sometimes called continental rebound, glacial isostasy, glacial isostatic adjustment) is the rise of land masses that were depressed by the huge weight of ice sheets during the last glacial period, through a process known as isostasy.


What does interglacial mean?

Adjective:Of or relating to a period of milder climate between two glacial periods. Noun:An interglacial period.


What is a Periods of rapid glacial movement are referred to as?

Periods of rapid glacial movement are referred to as glacial surges. These events are characterized by a sudden increase in glacial velocity, resulting in the movement of large quantities of ice over short periods of time. Glacial surges can drastically reshape the landscape and contribute to changes in local ecosystems.


Is the current Ice Age period the only time in Earth's history that massive glacial activity has shaped the land?

No: glacial activity occurs in all glacial phases of all Ice Ages, and we now see the results of the latest within the present Ice Age.


Are you in the Quaternary Period?

Yes. We currently live in an "interglacial period" of the Quaternary Ice Age. Some people confuse "ice age" with a "glacial period" within an ice age.