Season 1 Episodes13
Cast1

Corey Johnson
Self - Narrator (voice)
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Ranked #2 of 13 in Season 1•+0.3 vs season avg
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.

Corey Johnson
Self - Narrator (voice)
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"Great Lakes" is episode 7 of How the Earth Was Made season 1. It scored 8.6/10 from 39 votes, ranking #2 of 13 episodes this season (season average 8.3). It aired on March 24, 2009.