Discussion
The merging of cloud droplets by collision is called :
Answer: C
The merging of droplets by collision is coalescence.
In warm clouds larger drops fall faster than small ones, collide with them, and merge; this collision-coalescence process grows drops to raindrop size. Collision is only the first step; coalescence is the joining that follows, and not every collision leads to it.
Nucleation is the start of a droplet or ice crystal on an aerosol particle, and condensation is growth by diffusion of water vapour onto a droplet. Neither involves droplets merging.
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