Environmental Science
Bell-shaped polygonal pyramid indicates

low percentage of young individuals
low percentage of old individuals
high percentage of young individuals
moderate percentage of young individuals

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Environmental Science
The primary cause of a radiation inversion is:

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

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