Environmental Science
The aurora is produced by:

Scattering of sunlight in the upper atmosphere
The combination of molecular and atomic oxygen to form ozone
Reflections of sunlight by polar ice fields
Fast-moving charged particles colliding with air molecules
Burning oxygen caused by the intense sunlight at high altitude

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Environmental Science
Which of the following statements is not correct?

The relative humidity is a measure of the air's actual water vapor content.
The length of human hair changes as the relative humidity changes.
A change in the air temperature can change the relative humidity.
During the winter, low relative humidity can irritate the mucus membranes in the nose and throat.

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