Environmental Science
An important reason for the large daily temperature range over deserts is:

There is little water vapor in the air to absorb and re-radiate infrared radiation
The ozone content of desert air is very low
The light-colored sand radiates heat very rapidly at night
Free convection cells are unable to form above the hot desert ground
Dry air is a very poor heat conductor

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Environmental Science
The aurora is produced by:

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

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