The Coriolis effect is best described as?

The Coriolis effect is best described as?

• A. The acceleration due to gravity at the poles
• B. The decrease in wind speed with altitude
• C. The deflection of moving objects caused by Earth's rotation
• D. The change in air density with temperature

Answer: (C)

The moving objects feel a sideways deflection because the Earth is rotating, so motion is observed in a rotating frame. This sideways deflection, caused by the rotation of the planet, is what the Coriolis effect describes. In practice, it means that as you move, your path curves relative to the ground: to the right in the Northern Hemisphere and to the left in the Southern Hemisphere, with the effect strengthening for faster motion and away from the equator (and vanishing at the equator). This deflection is crucial for understanding why winds and storms spin and why ocean currents curve. The other statements describe gravity variations, vertical wind changes, or density changes with temperature, which are not about this sideways deflection produced by Earth's rotation.

The moving objects feel a sideways deflection because the Earth is rotating, so motion is observed in a rotating frame. This sideways deflection, caused by the rotation of the planet, is what the Coriolis effect describes. In practice, it means that as you move, your path curves relative to the ground: to the right in the Northern Hemisphere and to the left in the Southern Hemisphere, with the effect strengthening for faster motion and away from the equator (and vanishing at the equator). This deflection is crucial for understanding why winds and storms spin and why ocean currents curve. The other statements describe gravity variations, vertical wind changes, or density changes with temperature, which are not about this sideways deflection produced by Earth's rotation.