Environmental Science
The blueness of the sky is mainly due to:

The presence of water vapor
The scattering of sunlight by air molecules
Absorption of blue light by the air
Emission of blue light by the atmosphere

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

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

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