Which of the following is a major factor in the formation of the polar easterlies? MCQ with Answer and Explanation

Explanation:
The trade winds are formed by the Hadley cell circulation, where air flows from the subtropics towards the equator.

Explanation:
SOI measures the difference in sea level pressure between Tahiti (Central Pacific) and Darwin (Northern Australia). Negative SOI indicates El Niño conditions.

Explanation:
The polar vortex is primarily located in the stratosphere, with a tropospheric component. It is a seasonal phenomenon that is stronger during winter and weaker in summer.