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ACROSS
1)  an equal exchange
2)  any of numerous small rodents typically resembling diminutive rats having pointed snouts and small ears on elongated bodies with slender usually hairless tails
3)  the chief solid component of mammalian urine; synthesized from ammonia and carbon dioxide and used as fertilizer and in animal feed and in plastics
4)  a brittle silver-white metalloid element that is related to selenium and sulfur; it is used in alloys and as a semiconductor; occurs mainly as tellurides in ores of copper and nickel and silver and gold


DOWN
1)  a black colloidal substance consisting wholly or principally of amorphous carbon and used to make pigments and ink
2)  ligament made of metal and used to fasten things or make cages or fences etc
3)  the smallest whole number or a numeral representing this number
4)  seed of a pea plant used for food

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