Environmental Science
Which of the following enhances soil fertility?

Irrigation
Using new seed varieties
Crop rotation
Improved methods of agriculture

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Environmental Science
The main reason why vegetables take longer to cook in boiling water at high altitudes is because:

There is less oxygen in the air at high altitude
Water boils at a higher temperature with higher altitude
Saturation vapor pressure decreases with increasing altitude
The temperature of the boiling water decreases with increasing altitude

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