What is the effect of Earth's rotation on the direction of winds and currents?

• A. Increases wind speed significantly
• B. Coriolis Effect
• C. Thermal Expansion
• D. Pressure Gradient Force

Answer: (B)

The Coriolis Effect is the phenomenon that explains how Earth’s rotation influences the trajectory of winds and ocean currents. Due to the rotation of the Earth from west to east, moving air (or water) is deflected to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. This deflection occurs because the surface of the Earth is moving at different speeds depending on the latitude; areas near the equator are moving faster than areas near the poles.

As air masses move, they do not follow a straight path but instead curve as a result of this rotation. This is critical in the formation of weather patterns, trade winds, and ocean currents, which are essential for climate regulation. For example, the trade winds are predominately easterly due to the Coriolis Effect, while westerlies and polar easterlies exhibit similar patterns of deflection.

Other options do not directly address the specific impact of Earth's rotation on winds and currents.