Give three functions of Ziggurats in Sumerian society.

The precursors of the ziggurat were raised platforms that date from the Ubaid period[1] during the sixth millennium. The ziggurats began as a platform (usually oval, rectangular or square), the ziggurat was a mastaba-like structure with a flat top. The sun-baked bricks made up the core of the ziggurat with facings of fired bricks on the outside. Each step was slightly smaller than the step below it. The facings were often glazed in different colors and may have had astrological significance. Kings sometimes had their names engraved on these glazed bricks. The number of floors ranged from two to seven.

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