Environmental Science
The aurora is produced by:

Burning oxygen caused by the intense sunlight at high altitude
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

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Environmental Science
Which of the following helps to explain why even though northern latitudes experience 24 hours of sunlight on June 22, they are not warmer than latitudes further south?

Increased cloud cover reflects solar energy in the northern latitudes
Solar energy is spread over a larger area in northern latitudes
All of these
Some of the sun's energy is reflected by snow and ice in the northern latitudes
Solar energy is used to melt frozen soil in the northern latitudes

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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.
A change in the air temperature can change the relative humidity.
The length of human hair changes as the relative humidity changes.
During the winter, low relative humidity can irritate the mucus membranes in the nose and throat.

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