rock glacier

noun
a mass of rock resembling a valley glacier that moves or is moved down a slope by its own weight or by the action of frost and interstitial ice.

Origin:
1900–05

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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It is a rock glacier, or a collection of large rocks and boulders, with ice filling the in the empty spaces.
Inside a rock glacier, ice fills the spaces between the blocks.
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