1 2 3 4 1 _ _ _ _ 2 _ _ _ _ 3 _ _ _ _ 4 _ _ _ _ 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 ** Scroll down for solution. ** Are you sure you want to peek? moho urea geek sods