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
Burning oxygen caused by the intense sunlight at high altitude
Fast-moving charged particles colliding with air molecules

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Environmental Science
Which of the following statements is not correct?

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

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