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What positive contribution can atmospheric dust make in cloud formation?

Answer and explanation

Correct answer: Providing condensation nuclei for droplet formation

Atmospheric dust can help clouds form by acting as condensation nuclei. Water vapour in the atmosphere does not always begin condensing easily on its own. Tiny dust particles, salt particles, smoke, and similar aerosols provide surfaces on which water vapour can gather and form very small droplets. When many such droplets collect and grow, they contribute to cloud development.

Option A is correct because dust can provide nuclei for droplet formation. This does not mean that every dust particle automatically creates a cloud or that dust removes all moisture. Dust also does not always prevent precipitation; growing droplets may eventually contribute to rain under suitable conditions. The key idea is that some airborne particles make condensation easier by offering surfaces for vapour to change into liquid water. Thus, the positive contribution is facilitation of condensation.

Related tags

Atmospheric DustCondensation NucleiCloud Formation

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