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are etching

  • present progressive
    of etch.
    etch
    verb (used with object)
    to cut, bite, or corrode with an acid or the like; engrave with an acid or the like, as to form a design in furrows that when charged with ink will give an impression on paper.

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Scientists and the First Nations custodians of the site are warning that acidic emissions from a nearby petrochemical complex are etching away images densely spread across the 30-by-6-kilometer Burrup Peninsula and on nearby islands.

From Science Magazine ● May 11, 2023