Discussion
Which wet removal process cleanses the atmosphere of aerosol?
Answer: C
Particles serving as condensation nuclei are incorporated into cloud droplets and removed when the droplets precipitate, which is rainout, while falling drops also collect particles beneath the cloud, which is washout. Together these are far more effective than dry deposition for fine particles. Sedimentation is negligible for particles below about a micrometre, since their fall speeds are measured in millimetres per hour, which is why they persist for a week or more in the absence of precipitation.
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