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In which situation does coalescence help in rainfall formation?

Answer and explanation

Correct answer: In warm clouds, small droplets collide and form larger drops

Coalescence is the joining of small cloud droplets. In a warm cloud, droplets of different sizes move through the cloud, collide, and merge. Repeated collisions produce larger and heavier drops. When a drop becomes large enough for gravity to overcome the upward air currents and resistance, it can fall as rain. This is an important mechanism of warm-cloud or collision-coalescence rainfall.

Option A is correct because it describes small droplets colliding and forming larger drops in warm clouds. Dry air cannot create drops without water, and cloud droplets do not all instantly change into vapour. Earthquakes are not the normal cause of this process. The essential sequence is collision, merging, growth, and eventual fall as precipitation.

Related tags

CoalescenceWarm CloudRainfall

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