Environmental Science
Which of the following enhances soil fertility?

Crop rotation
Improved methods of agriculture
Irrigation
Using new seed varieties

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Environmental Science
Low clouds retard surface cooling at night better than clear skies because:

The clouds absorb and radiate infrared energy back to earth
The clouds are better conductors of heat than is the clear night air
The water droplets in the clouds reflect infrared energy back to earth
The formation of the clouds releases latent heat energy
The clouds start convection currents between them

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