Populations of these cities grew because of the food, crops, and agriculture produced. Farming made life in cities a lot easier and provided people with a steady income of food. those living in mesopotamia finally found a reliable food source. not only this, but the Tigris and Euphrates Rivers were very important to the agriculture process as they provided a water source for the crops and drinking
Not so sure about the shape . i do know however its a cold and a warm front spinning around and around maybe that might answer depending on the question
