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ACROSS
1)  the boundary between the earth's crust and the underlying mantle
2)  the chief solid component of mammalian urine; synthesized from ammonia and carbon dioxide and used as fertilizer and in animal feed and in plastics
3)  a carnival performer who does disgusting acts
4)  surface layer of ground containing a mat of grass and grass roots


DOWN
1)  the quantity that can be held in a mug
2)  chocolate cookie with white cream filling
3)  paying particular notice (as to children or helpless people)
4)  the hard durable wood of any oak; used especially for furniture and flooring

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moho
urea
geek
sods