Why does the water from the Atlantic Ocean not leak into the Great lakes?

why does not eventually drain into the Great lakes…I know it has something to do with the tides, but i don’t know exactly why…my 11 year old son asked me and I thought maybe someone out there might have the answer for him…thanks in advance.

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One Response to “Why does the water from the Atlantic Ocean not leak into the Great lakes?”
  1. Vincent G says:

    The Great Lakes are quite high above the sea level. Superior for instance, has its surface is 600 ft above sea level. The flow from one lake to the next, going through 170 ft Niagara falls, and after exiting lake Ontario, the water goes to the St-Laurent river.

    Around Quebec city is where tide stops being felt, so from them on it is essentially sea level.

    Having the flow reverse more inland that Quebec would involve water getting uphill.

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