Environmental Science
Where cold surface air replaces warm air, the boundary separating the different bodies of air is:

A warm front
A cold front
A tornado
A parallel of latitude

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Environmental Science
The primary cause of a radiation inversion is:

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

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