The correct answer is Earth’s Rotation. • The Coriolis effect is the result of Earth's rotation. Explanation & Key Takeaways: • Coriolis Force: • The Coriolis effect is the pattern of deflection which objects take while travelling through long distances on Earth. • The key to the Coriolis effect is the result of Earth’s rotation. • Because of the Coriolis force, all the winds are deflected to the right in the Northern Hemisphere. • They are deflected to the left in the Southern Hemisphere. • This is referred to as Farrell’s Law. • The Coriolis force is absent along the equator but increases progressively towards the poles. • Related Concepts: • The rate of change of pressure with respect to distance is the pressure gradient. • The pressure gradient is strong where the isobars are close to each other and are weak where the isobars are apart.