The planetary wind belts in the troposphere are primarily caused by the

The planetary wind belts in the troposphere are primarily caused by the Earth's rotation and the unequal heating of Earth's surface. 

Planetary wind belts are vast movements and they are driven by the circulation of air. The Sun's heat causes the winds around the world. It heats the tropical zone primarily than the polar regions because the sun's rays are more direct at the equator.

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