Environmental Science
Carbon dioxide is called greenhouse gas because it is

Transparent to sunlight but traps heat
Transparent to both sunlight and heat
Used in green-house to increase plant growth
Transparent to heat but traps sunlight

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Environmental Science
The primary cause of a radiation inversion is:

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

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