What's the term to refer to the 'green stuff' in this picture:
https://depositphotos.com/265725050/stock-photo-sea-stones-covered-green-algae.html
Would it correct to say:
"He slid on the sludge, and broke a bone."
No. Use lichen or moss. It does not look like slime, goo or muck.
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No. Use lichen or moss. It does not look like slime, goo or muck. (All these are thick semi-solids or liquids.)