Which of the following is correct in the context of artificial rain?

AArtificial rain is called cloud seeding ✓ Correct

BArtificial rain precipitates the clouds

CThe most common chemicals used are silver iodide, potassium iodide and dry ice

DAll of the above

Correct answer: (A) Artificial rain is called cloud seeding

Explanation

Artificial rain is produced by cloud seeding, which is simply another name for the technique.

Saying artificial rain precipitates the clouds is loose wording, since it induces rain rather than precipitating clouds themselves.

Silver iodide, potassium iodide and dry ice are indeed the usual seeding agents.

The defining fact is that artificial rain is called cloud seeding.

Seeding agents give water droplets nuclei on which to condense and grow heavy enough to fall.

Cloud seeding needs existing moisture-laden clouds to work.

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