Answer: Shape
Explanation: The fertile crescent refers to the territory of Mesopotamia. Mesopotamia, as the cradle of the earliest civilization, means in translation between rivers, because it lies between the Tigris and Euphrates rivers. The specific area of Mesopotamia between the rivers (the seat of early civilizations, later that territory expanded beyond the area) has the form of a crescent. In addition, this plain has fertile land, hence the name fertile crescent, so the name derived from its shape.
