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4  _  _  _  _


ACROSS
1)  a british imperial capacity measure (liquid or dry) equal to 4 gills or 568.26 cubic centimeters
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)  an article deposited as security
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)  an insect in the inactive stage of development (when it is not feeding) intermediate between larva and adult
2)  a theocratic islamic republic in the middle east in western asia; ____ was the core of the ancient empire that was known as persia until 1935; rich in oil
3)  small usually bright-colored semiaquatic salamanders of north america and europe and northern asia
4)  a browning of the skin resulting from exposure to the rays of the sun

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