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ACROSS
1)  trying something to find out about it
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 container; usually has a lid
4)  social insect living in organized colonies; characteristically the males and fertile queen have wings during breeding season; wingless sterile females are the workers


DOWN
1)  the lowest brass wind instrument
2)  an early name of ireland that is now used in poetry
3)  100 ____i equal 1 kroon in estonia
4)  a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite

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