Ancient civilizations were built along rivers because the land was fertile.
A. Earths atmosphere contains 78 percent oxygen, which is essential for life.
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Answer:
Waterwheel, Ḥamāh, Syria, similar to those long used for irrigation in the Tigris-Euphrates region. In Iraq most of those crops depend on irrigation, which can be applied in three ways: by flow from rivers and canals through small channels, by lifting with wheels or pumps into channels, and by direct inundation.