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Home > Deserts Of The World > Question

What is the name of the dark, shiny coating often found on rocks in arid environments, which ancient peoples used as a canvas for petroglyphs?

0
A) Loess
B) Caliche
C) Desert pavement
D) Desert varnish

Correct Answer: D) Desert varnish

Desert varnish is a dark, manganese- and iron-rich coating on exposed rock surfaces. It forms extremely slowly over thousands of years due to the action of microorganisms. Ancient cultures often carved or pecked through this dark layer to create rock art.

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