Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun a dark
coating on rocksurfaces exposed to theatmosphere which grows at only a fewmicrometers perthousand years ; found especially inarid deserts
Etymologies
Sorry, no etymologies found.
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Examples
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Researchers at the University of Nevada, Reno analysed nearby precarious boulders coated in "rock varnish", a clay-rich substance that builds up over long-term time in deserts.
'They're the witnesses of what happened': The precarious boulders that defy earthquakes Richard Fisher 2024
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