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H14 Frost damage. Yellowstone National Park, Wyoming, USA
Position:
N44° 50'
W110° 40' approx.
Elevation:
7500' / 2300m approx.
Image format:
35mm
FROST DAMAGE
Water expands when it freezes. Pockets of water trapped beneath
the surface of a road, as in this example, can physically damage
their surroundings during the alternating freezing and thawing
that may occur through the course of a year. In America's Yellowstone
National Park, Wyoming, FROST HEAVES can damage roads by creating
small potholes that quickly grow larger with the passage of motor
vehicles. The same WEATHERING PROCESS known as FREEZE-THAW, takes
place in cracks and PORE SPACES in rocks and contributes to their
destruction. Frost action is most effective in climates where
the daily temperatures dip below freezing at night and rise above
it by day. Where it is too cold, the process is just as ineffective
as where it is too warm.
Less detail
Image Trail:
L81 Glaciated mountains and corrie, Sierra Nevada, California, USA
Links:
http://www.nps.gov/yell/nature/geology/index.htm
http://geography.com.sg/weathering/index.html |
