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Definition of Rock varnish
1. Noun. a dark coating on rock surfaces exposed to the atmosphere which grows at only a few micrometers per thousand years; found especially in arid deserts ¹
¹ Source: wiktionary.com
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1. Noun. a dark coating on rock surfaces exposed to the atmosphere which grows at only a few micrometers per thousand years; found especially in arid deserts ¹
¹ Source: wiktionary.com