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This is an exposed portion of an ice wedge in the Permafrost Tunnel. Water works its way into cracks, expands, and freezes repeatedly over thousands of years, creating wedges of pure water ice deep in the permafrost. At the Permafrost Tunnel in Fox, Alaska.

Credit to read: Photo by Zeb Polly, Courtesy of Casey O'Hara (PolarTREC 2009/2010), Courtesy of ARCUS

Photographer: Casey O'Hara
Category: 
Year: 
2009
Program: 
PolarTREC
Region: 
Amundsen-Scott South Pole Station
Topic: 
File Information
Focal Length: 
26mm
File Size: 
1112649
Computed Mime: 
image/jpeg
Max Aperture: 
f/4.0
Height: 
997
Width: 
1500
Make: 
NIKON CORPORATION
Model: 
NIKON D40
Exposure Time: 
1/60s
ISO: 
450

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