Uneven heating creates __________.

• A. calm air
• B. condensation
• C. turbulence and wind
• D. stratification

Answer: (C)

Uneven heating of the surface causes some air to rise while adjacent air moves in to take its place. This creates vertical motion (convection) and, as the rising warm air interacts with cooler surrounding air, irregular, fluctuating flow—what we experience as turbulence and wind. Calm air would be unlikely in these conditions because the temperature differences keep driving ongoing air movement. Condensation can occur when rising air cools to its dew point, but that's a consequence of lifting and humidity, not the defining result of uneven heating itself. Stratification refers to stable layering of air by temperature, which isn't the immediate outcome of uneven heating in the context of generating turbulence and wind. So the combination of turbulence and wind best captures the effect of uneven heating.