Environmental Science
What is desertification?

All of these
Conversion of croplands into desert
Conversion of forests into desert
Conversion of grassland into desert

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Environmental Science
When clouds are viewed near the horizon, the individual cloud elements usually:

Appear closer together than is actually the case
Appear lighter in color than is actually the case
Appear to have more vertical development than is actually the case
Appear farther apart than is actually the case

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