Environmental Science
Condensation nuclei may be:

All of these
Nitric acid particles
Smoke from forest fires
Salt from the ocean
Particles of dust

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Environmental Science
The primary cause of a radiation inversion is:

Infrared radiation absorbed by the atmosphere and clouds
Solar radiation absorbed by the earth's surface
Infrared radiation absorbed by the earth's surface
Solar radiation reflected by the earth's surface
Infrared radiation emitted by the earth's surface

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