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ACROSS
1)  a tributary of the rhine
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)  the state of owing something (especially money)
4)  opinion or judgment


DOWN
1)  socially incorrect in behavior
2)  united states chemist who discovered deuterium (1893-1981)
3)  (greek mythology) the goddess of youth and spring; wife of hercules; daughter of zeus and hera; cupbearer to the olympian gods
4)  any of various long-tailed rodents similar to but larger than a mouse

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ruhr
urea
debt
eyes