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3. a group of people or elements with obvious differences between one another
5. an artificial waterway constructed to allow the passage of boats or ships inland or to convey water for irrigation.
7. a barren, arid landscape receiving extremely low rainfall
8. a society along the Nile River, south of Egypt, from about 2000 B.C.E. to 350 C.E.
10. a low area of land between hills or mountains, typically with a river or stream flowing through it.
11. something that influences or causes a result
13. a nation in Northeast Africa, first settled around 3100 B.C.E.
14. the longest river in the world, flowing through eastern Africa to a delta in northeastern Egypt
15. a long,narrow ditch
16. relating to the natural world and the impact of human activity on its condition.
17. a land northeast of Egypt, settled by the ancient Israelites, from about 1800 to 70 C.E.
18. the weather conditions prevailing in an area in general or over a long time period
19. people from the ancient land of Cush (or Kush), a powerful kingdom located south of Egypt in Nubia

1. a river in southwestern Asia that flows from the Lebanon Mountains, south through the Sea of Galilee, into the Dead Sea
2. a body of water north of Africa
4. the natural features on the surface of the eatopography the shape and elevation of surface features, such as mountains or deserts, of a place or region
6. one part of something
9. a place, typically one that has hitherto been uninhabited, where people establish a community.
10. the plants of a place or region
12. long, narrow, and incredibly salty inlet of the Indian Ocean