_____________ are often found on canyon walls where artists could scrape away the dark brown bacterial staining called "desert varnish" and expose the lighter sandstone beneath.

Question

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Petroglyphs are images that are carved or etched into rock surfaces, such as canyon walls. These images are often found on walls where the desert varnish has been scraped away, revealing lighter-colored sandstone beneath. Petroglyphs are a form of rock art that has been created by various cultures throughout history, and they can be found in many parts of the world.

_____________ Are Often Found on Canyon Walls Where Artists Could