1 2 3 4 1 _ _ _ _ 2 _ _ _ _ 3 _ _ _ _ 4 _ _ _ _ ACROSS 1) be obliged to pay or repay 2) a hinged catch that fits into a notch of a ratchet to move a wheel forward or prevent it from moving backward 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 member of a slavic people who settled in ____ia and neighboring areas in the 6th and 7th centuries DOWN 1) a musical work that has been created 2) articles of the same kind or material; usually used in combination: `silver____', `soft____' 3) an open vessel with a handle and a spout for pouring 4) block consisting of a thick piece of something ** Scroll down for solution. ** Are you sure you want to peek? owes pawl urea serb