1  2  3  4 

1  _  _  _  _

2  _  _  _  _

3  _  _  _  _

4  _  _  _  _


ACROSS
1)  a written agreement between two states or sovereigns
2)  a person who makes use of a thing; someone who uses or employs something
3)  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
4)  united states virologist who developed the ____ vaccine that is injected against poliomyelitis (born 1914)


DOWN
1)  a humorous play on words
2)  the largest continent with 60% of the earth's population; it is joined to europe on the west to form eur____; it is the site of some of the world's earliest civilizations
3)  any small compartment
4)  a journey by ox wagon (especially an organized migration by a group of settlers)

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