WORLD CIVILIZATION

Detailed explanation-1: -So Sumerians began to build strong walls around their cities. The walls were made of mud bricks that were baked in the sun until they were hard. The Sumerians also dug moats outside the city walls to prevent enemies from entering the city. Most people lived in houses behind the walls, while the farms lay outside.

Detailed explanation-2: -Ziggurats were huge pyramidal temple towers which were first built in Sumerian City-States and then developed in Babylonia and Assyrian cities as well.

Detailed explanation-3: -Sumerian architecture is characterized by its use of mud brick and the development of the arch and the dome. The use of mud brick allowed for the construction of large, complex structures, and the arch and dome were important innovations that allowed for the construction of large, open spaces.