Most of Earth's deserts are located in the subtropical zone because these regions are very warm but less humid than other regions. In the subtropical zone, warm air rises and moves toward the poles, where it cools and sinks. This sinking air creates a high-pressure area, which inhibits the formation of clouds and leads to dry conditions. Additionally, the dry air in the subtropical zone can also lead to increased evaporation, which further reduces the amount of moisture in the atmosphere and contributes to desertification. This combination of warm temperatures, low humidity, and dry conditions is what makes the subtropical zone a prime location for the formation of deserts.