Fertile Crescent - boomerang-shaped region in Middle East, home to earliest human civilizations., Mesopotamia - land between the rivers, Tigris River - the river to the east of Mesopotamia - flows swiftly, Euphrates River - the river to the west of Mesopotamia - flows more slowly, Silt - an especially fine and fertile soil carried by water, Irrigation - watering fields using human-made systems, Ox-driven plow - a tool that broke up hard-baked summer soil and prepared large areas for planting.,

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