Which is most often a result of a warm air mass moving over a cooler air mass? A. a decrease in wind speed B. a decrease in cloud cover C. an increase in precipitation D. an increase in air pressure

C. an increase in precipitation<br /><br />When a warm air mass moves over a cooler air mass, it often leads to the formation of clouds and precipitation. This is because the warm air rises over the cooler, denser air, leading to condensation as the warm air cools. This process can result in increased cloud cover and precipitation, such as rain or snow, depending on the temperature conditions.