Environmental Science
When the air temperature is below freezing, the saturation vapour pressure over water is .

Greater than the saturation vapour pressure over ice
Equal to the saturation vapour pressure over ice
Equal to zero
Less than the saturation vapour pressure over ice

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Environmental Science
How do red and blue light differ?

The wavelength of red light is longer.
Red light has a higher intensity.
Red and blue light have different directions of polarization.
Blue light has a higher speed of propagation.

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