1 2 3 4 1 _ _ _ _ 2 _ _ _ _ 3 _ _ _ _ 4 _ _ _ _ ACROSS 1) the act of ____ning; systematic examination of a prescribed region 2) a member of the south american indian people living in brazil and paraguay 3) norwegian mathematician (1802-1829) 4) installation from which a military force initiates operations DOWN 1) a sudden sharp feeling 2) a communist state in the caribbean on the island of ____ 3) any of various primates with short tails or no tail at all 4) the world's longest river (4150 miles); flows northward through eastern africa into the mediterranean; the ____ river valley in egypt was the site of the world's first great civilization ** Scroll down for solution. ** Are you sure you want to peek? scan tupi abel base