![How the Earth Was Made](https://image.tmdb.org/t/p/w342/wcqD8LcyLfqh86JuR4ReYMB3mSu.jpg)
2 Season
26 Episode
How the Earth Was Made - Season 1 Episode 7 Great Lakes
Scientists seek clues to the formation of North America's Great Lakes, the largest expanse of fresh water on the planet; delving into an underground salt mine; investigating a fossilized coral reef; diving to the bottom of Lake Superior.
- Country : United States of America, United Kingdom
- Genre : Documentary
- Director : Susan Werbe, Stuart Carter, Stephen Marsh
- Cast : Corey Johnson