Environmental Science
The north-facing side of a hill in a mountainous region in the US tends to:

All of these
Grow a variety of trees that are typically observed at higher elevation
Have snow on the ground for a longer period of time in winter compared to the south-facing side
Receive less sunlight during a year than the south-facing side
Be a better location for a ski run than the south-facing side

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Environmental Science
The aurora is produced by:

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

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Environmental Science
Which of the following statements is not correct?

During the winter, low relative humidity can irritate the mucus membranes in the nose and throat.
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.

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