Credit: PETER MATULAVICH/SCIENCE PHOTO LIBRARY

Caption: Rising 120 meters above Lake Michigan, Sleeping Bear Dunes in Michigan are formed by sand that is blown atop glacial moraines, and are referred to as perched sand dunes. Much of the sand is composed of uniform quartz particles that are blown from the adjacent lakeshore and highlands. Lake Michigan is one of the five Great Lakes of North America, and the second largest. These freshwater lakes were formed about 10,000 years ago when great ice sheets, two miles thick, retreated following the last ice age.

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Keywords: blown sand, dune, geologic, geology, great lake, great lakes, lake, lake michigan, landscape, michigan, perched, sleeping bear dunes, usa, wind

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Sleeping Bear Dunes

K002/1907 Rights Managed

Downloadable master

Duration: 00:00:11.17

Frame size: 640x480

Frame rate: 29.97

Audio: No

Format: QuickTime, Photo JPEG 100%, progressive scan, square pixels

File size: 125.1M

Original

Capture format: Betacam SP

Frame size: 720x486

Codec: Uncompressed 8-bit 4:2:2

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