The sun heats the ground, and plumes of hot air rise. Then cooler air rushes in to replace it. Then the air cools off and sinks, pushing the air below it out to the sides. This gets crazy complicated, because when air moves north or south it starts moving east or west due to the difference in tangential speed between where it started and where it is now, but sunlight absorbed and heat radiated into space the primary energy flow that drives it.
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