Environmental Science
At middle latitudes, the base of an altostratus or altocumulus cloud would generally be found between:

Above 43,000 feet
200 and 6,500 feet
23,000 and 43,000 feet
6,500 and 23,000 feet

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Environmental Science
The aurora is produced by:

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

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