Answer:
Egypt - pyramid
Indus valley- Water tanks and citadels
Mesopotamia - ziggurats
Explanation:
Egypt - pyramid
Egypt civilization had pyramid architecture.
Indus valley- Water tanks and citadels
Indus valley civilization was associated with water tanks and citadel.
Citadel means building an upper part of field to avoid flood.
Mesopotamia - ziggurats
The civilization of Mesopotamia ( between two rivers ) was associated with ziggurats i.e. it is a form of terraced compound with multi storeyed level.
