Answer :
As air sinks into the atmosphere it compresses and heats.
What are heat air masses?
Heat air masses are compressed masses of air in the atmosphere, which are especially located in low-latitude areas.
Sinking air is well known to be compressed and heated, and differential pressure in the air is required to produce winds.
In conclusion, as air sinks into the atmosphere it compresses and heats in order to produce heat air masses.
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