Treaty - Agreement between two or more nation-states on peace, alliance, or trade., Silt - Nutrient-rich soil that is deposited along rivers after seasonal flooding., Cultivate - The preparation and working of a piece of land in order to raise crops for harvest., Mettalurgy - Materials science that studies the physical/chemical behavior of metallic elements., Pictogram - Simple pictures which depict various objects used in daily life., Ziggurat - Term describing a Sumerian temple., Irrigation - The supply of water to land or crops to help, typically by means of channels., Arch - A curved structure that spans a window, door, or other opening.,

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