If warm air slowly rises over cold air, which type of rainfall is more likely?

Correct answer: Frontal or cyclonic rainfall

Correct answer: A. When two air masses with different temperatures meet, the boundary between them is called a front. Warm air is lighter, so at a warm front it tends to rise gradually over denser cold air. As the warm air rises, it expands and cools. Water vapour may then condense into clouds and produce widespread, usually gentler and longer-lasting frontal rain. Similar uplift can occur in a low-pressure or cyclonic system, where converging air rises and clouds form. A is correct because the stated slow lifting over cold air describes frontal uplift. B is wrong because hail usually needs strong convective updrafts and does not follow from slow frontal lifting alone. C is wrong because frost forms when water deposits or freezes on cold surfaces, not as the main result of rising warm air. D is wrong because ordinary rainfall requires condensation and cloud development. Memory cue: slowly rising warm air over cold air points to a front; rapidly rising warm air points more toward convection.