The natural phenomenon associated with the Coriolis effect is the rotation of the Earth. The Coriolis effect describes how the rotation of the Earth influences the movement of air and water, causing moving objects to curve rather than travel in a straight line. In the Northern Hemisphere, this results in a deflection to the right, while in the Southern Hemisphere, it deflects to the left. This effect is crucial for understanding weather patterns and ocean currents, significantly affecting climate systems and the formation of cyclones and anticyclones.