What condition follows when surface air moves from land to a water body like a lake?

• A. Increased friction
• B. Decreased friction
• C. Stable wind conditions
• D. Higher temperatures

Answer: (B)

When surface air transitions from land to a water body such as a lake, the primary condition that occurs is decreased friction. This is because land surfaces typically have rough textures, including vegetation, buildings, and other obstacles that can create turbulence and friction against the movement of air. In contrast, bodies of water exhibit much smoother surfaces, allowing air to flow more freely.

As the air moves over the smooth surface of the water, the frictional forces acting on the air decrease significantly. This reduction in friction leads to a more streamlined airflow, which can influence local weather patterns and conditions, such as enhanced wind speeds over the water. Understanding this concept is essential for comprehending how local topography and surface characteristics affect wind behavior and weather phenomena.