Rain drops in warm clouds form from the collision and coalescence of smaller droplets, that have themselves formed on cloud condensation nuclei.
(Rain drops in warm clouds; form; from the collision and coalescence of smaller droplets) (smaller droplets; have formed; L:on cloud condensation nuclei)
Rain drops in warm clouds smaller droplets
form have formed
from the collision and coalescence of smaller droplets
L:on cloud condensation nuclei