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Lake Michigan Trivia Questions

How much do you really know about Lake Michigan? Below are 8 true or false statements. Click each one to reveal the answer and explanation.

1.

Lake Michigan is deeper than Lake Superior.

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Easy
✗ FALSE

Lake Superior is the deepest Great Lake at 1,332 feet; Lake Michigan’s maximum depth is only 925 feet.

2.

Lake Michigan experiences seiches—giant, tsunami-like waves caused by air pressure changes.

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Medium
✓ TRUE

Seiches can push water up to six feet high in minutes, famously flooding Chicago’s lakefront in 1954.

3.

A large population of bull sharks has been documented living in Lake Michigan year-round.

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Medium
✗ FALSE

Bull sharks can survive in fresh water, but no breeding population exists in Lake Michigan; only a few rare sightings have occurred.

4.

Lake Michigan is the only Great Lake entirely within the United States.

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Medium
✓ TRUE

Unlike the other four Great Lakes, Lake Michigan is not shared with Canada; its entire shoreline lies in the U.S.

5.

Lake Michigan’s water level has been known to drop by over six feet in a single day.

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Medium
✗ FALSE

Water level changes are gradual, driven by climate and evaporation; seiches cause temporary shifts but not sustained drops that large.

6.

The lake contains a sunken forest of petrified trees visible from the surface on calm days.

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Hard
✗ FALSE

While submerged forests exist in Lake Michigan, they are not petrified and are only visible underwater, not from the surface.

7.

Lake Michigan was once connected to the Mississippi River via a natural glacial channel.

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Hard
✓ TRUE

During the last Ice Age, meltwater from Lake Michigan flowed into the Mississippi via the Illinois River valley, before the current basin formed.

8.

Lake Michigan has a hidden underwater sinkhole that hosts ancient microbial life.

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Hard
✓ TRUE

Near Alpena, Michigan, a deep sinkhole contains dense, purple microbial mats, preserving conditions from thousands of years ago.

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