The Great Lakes - How They Were Formed

Duration: 3:00

Year Published: 1951

Format: 16mm

Sound: sound

Description: Depicts the work of glaciers in forming the Great Lakes thousands of years ago. Describes the presentday drainage of the lakes and the physical characteristics of Niagara Falls. Illustrates topographical changes now occurring. , L: Limited Access CP: Composite Positive AC: Acetate A: 400' 16/8/9.5mm 16mm Black & White Sound 300

Complete Record: Depicts the work of glaciers in forming the Great Lakes thousands of years ago. Describes the presentday drainage of the lakes and the physical characteristics of Niagara Falls. Illustrates topographical changes now occurring. NOTE: Two (or more) records have been merged together to create this data.

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