Final answer:
Water moving in smooth parallel layers is called laminar flow and water moving chaotically is called turbulent flow. Laminar flow has smooth streamlines while turbulent flow is characterized by eddies and mixing of the fluid layers.
Step-by-step explanation:
Water moving smoothly in parallel layers is called laminar flow, but water moving in a chaotic nature downstream is called turbulent flow. Laminar flow is described by layers of fluid that move in parallel, regular paths without intermixing. This flow can be visualized as smooth and continuous streamlines. On the other hand, turbulent flow features irregular, colliding paths that result in mixing and swirling, which can be seen in the form of eddies and disturbances in the fluid's streamlines. Turbulent flow is typically caused by obstructions, sharp corners, or high fluid speeds which impart velocities perpendicular to the flow, resulting in increased drag and the formation of swirls.