pressure ridge

noun
1.
a ridge produced on floating ice by buckling or crushing under lateral pressure of wind or ice.
2.
Geology. a ridge produced on a congealing lava flow by pressure from the still-liquid interior.

Origin:
1895–1900

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Huge blocks of ice forming a pressure ridge with scientist providing scale of
  features.
Jumbled ice on horizon is the pressure ridge at the edge of the floe.
The spring weather that triggers the pulse features a strong western high
  pressure ridge.
Generally fair weather is found in a surface high pressure ridge.
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