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.

Genre:

Documentary

Seasons:

2

Episodes:

26

Cast:

Corey Johnson

Quality:

HD

Duration:

45 min

First Air:

2009

Rating:

7.3