Which major climate zone is defined primarily by insufficient moisture, where the potential loss of water through evaporation exceeds the actual precipitation, leading to the formation of Earth’s major deserts and semi-arid steppes?

💡 Explanation:

The Arid or Dry climate zone (often designated as B in the Köppen system) is uniquely defined not by temperature, but by the lack of precipitation relative to the demand for moisture (evapotranspiration). This moisture deficit is the characteristic that creates deserts (true arid) and steppes (semi-arid).