Which atmospheric process yields precipitation by raindrop coalescence in warm clouds?

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Multiple Choice

Which atmospheric process yields precipitation by raindrop coalescence in warm clouds?

Collision-coalescence is the main way rain forms in warm clouds. When temperatures stay above freezing, droplets remain liquid and come in a range of sizes. Larger droplets fall faster and collide with smaller ones, sticking together to form bigger drops. This process continues until drops become large enough to overcome updrafts and air resistance, then they fall as rain. The Bergeron process operates in cold, mixed-phase clouds with ice crystals, not in warm clouds. Condensation creates cloud droplets but doesn’t by itself produce rain without subsequent growth by collisions, and sublimation is the transition from solid to gas, not how rain forms.

Collision-coalescence is the main way rain forms in warm clouds. When temperatures stay above freezing, droplets remain liquid and come in a range of sizes. Larger droplets fall faster and collide with smaller ones, sticking together to form bigger drops. This process continues until drops become large enough to overcome updrafts and air resistance, then they fall as rain. The Bergeron process operates in cold, mixed-phase clouds with ice crystals, not in warm clouds. Condensation creates cloud droplets but doesn’t by itself produce rain without subsequent growth by collisions, and sublimation is the transition from solid to gas, not how rain forms.

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