How the Earth Was Made.docx - How the Earth Was Made Great...

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How the Earth Was Made: Great Lakes Video Assignment Alexis McCoy 20 New/Interesting Facts 1. Below Lake Huron and Lake Michigan there are huge salt mines. 2. The largest underground salt mine in the world is below Lake Huron. 3. The salt mine was discovered by accident, the people who found it were looking for oil. 4. The hundreds of layers of salt prove that there was once a salt-lake/sea that evaporated and refilled hundreds of times. 5. 35% of North America’s salt comes from those mines under Lake Huron and Lake Michigan (table salt and to cover icy roads). 6. Millions of years ago there was a coral reef that extended far below and wider than Lake Michigan. 7. Niagara Falls helps figure out when water started flowing into the Great Lakes. 8. In the last 200 years, Niagara Falls has receded 3 feet/year. 9. Niagara Falls is merely 12,000 years old. Since Niagara Falls are around 12,000 years old, that means that the Great Lakes are not much older.
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  • Fall '18
  • Dennis Burin
  • Geography, Great Lakes

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