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silt-loose soil carried by water
drought-long period with out rain
levee-a wall that keeps a river within its banks
irrigation-a system of canals to bring water
to crops and fields
erosion-the wearing away of soil by wind or water
cuneiform-A system
of writing that used wedge-shaped symbols to represent sounds, ideas, and objects; developed in ancient Sumer.
scribe-an
official writer
city-state-a self-governing city that also governs nearby villages
ziggurat-tall,
flattened pyramid made of mud-brick
polytheism-a belief in many gods or goddesses
empire-a
group of lands and people ruled by one government
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