Origin of the Great Lakes: a Geology Field Trip

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The Great Lakes look more like seas than lakes, but in fact hold 20% of the world's fresh water! How did they form, and where did their beaches and sand dunes come from? Let's learn about the fascinating tectonic and glacial geology that formed these incredible features of the North American continent.

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Intro and outro music: Overture of Die Zauberflöte (The Magic Flute) by Mozart

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00:00 Intro
00:29 A failed ocean?
01:48 Indiana Dunes National Park
02:33 Ice Ages
02:57 Isostatic Rebound
03:44 Where did the sand dunes come from?
07:56 Climbing the dunes
09:31 The way beaches used to look
10:40 Will the Lakes dissapear?
11:58 Outtakes

#greatlakes #geology #nature