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. In dry countries, farmers use ----- systems to water their crops.
irrigation
Some animals live in ------ habitats—streams, rivers, and lakes.
freshwater
A long, narrow, open hole made at the side of a field or road
Ditch
A chinampa is an ----- built on a lake.
island
Mexico City was built on a ------ , so it was very wet. The Aztecs invented a system of chinampos.
swamp
______ stopped the flooding and controlled the river.
A dam
For thousands of years, people in Egypt have dug ----- and ditches to take water to their fields next to the river
canals
The ancient Romans built special -----, called aqueducts
bridges