scummed
Past participle ofscum.There are other translations for this conjugation.

scum

After three years of poor rains, many of the usual water sources were tapped out, clogged with silt, or so stagnant they are scummed over with algae.
Después de tres años de escasez de lluvia, muchas fuentes de agua se secaron, se taparon con sedimento o están tan estancadas que están cubiertas de algas.
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