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Uploaded on:
14/02/2009 02:51:16
Type:
Digital Asset
File Size:
298.71 KB
Dimensions:
1001 x 724 pixels
2612 views 4 downloads
P number: P002149
Old photograph number: C01785
Caption: The south side of the arete at the head of Allt a' Mhuilinn on the east side of Ben Nevis, Inverness-shire. Frost-shattered granite showing splitting action along joints and the development of scree slopes below.
Description: The south side of the arete at the head of Allt a' Mhuilinn on the east side of Ben Nevis, Inverness-shire. Frost-shattered granite showing splitting action along joints and the development of scree slopes below. Frost action is an exceedingly powerful agent in the mechanical disintegration of surface rocks. In the cold climate of a Scottish winter at this altitude, water enters the fine crevices, pores and joints of the granite. On freezing and turning to ice the water has a 10.9% increase in volume. This exerts a tremendous force that tends to both split the rock along the joints and between mineral grains in the rock. With repeated freeze-thawing the blocks eventually detach and if above a steep slope will fall and form a scree slope as in the photograph.
Date taken: 01/01/1910
Photographer: Lunn, R.
Copyright statement: Crown
Acknowledgment: This image was digitized with grant-in-aid from SCRAN the Scottish Cultural Resources Access Network
X longitude/easting: 217500
Y latitude/northing: 771500
Coordinate reference system, ESPG code: 27700 (OSGB 1936 / British National Grid)
Orientation: Landscape
Size: 298.71 KB; 1001 x 724 pixels; 85 x 61 mm (print at 300 DPI); 265 x 192 mm (screen at 96 DPI);
Average Rating: Not yet rated
Categories: Unsorted Images, Geoscience subjects/ Landforms, weathering/ Rock weathering, Geoscience subjects/ Landforms, weathering/ Weathering along bedding. Joints, cleavage, Geoscience subjects/ Landforms, weathering/ Frost action and debris  

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