Crossword puzzle clue "treatment plant matter"

Here are the possible solutions for treatment plant matter clue

Answer
Clue
Relevancy
sewage
Clue
Treatment-plant matter
peat
Clue
Plant matter used as a plant covering
Definition
a substance composed of partially decayed vegetable matter
levity
Clue
Disrespectful treatment of a serious matter
Definition
frivolity
age
Clue
"___ is an issue of mind over matter.If you don't mind, it doesn't matter." (Mark Twain)
Definition
to grow old
idea
Clue
Matter for the gray matter
Gray matter matter?
Gray matter matter
Definition
a conception or a plan
makeamentalnote
Clue
Put some matter in the gray matter?

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