Environmental Science
The aurora is produced by:

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

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Environmental Science
Our seasons are caused by:

The angle at which sunlight reaches the earth
Only (b) and (c) are correct
All of these
The length of the daylight hours
The changing distance between the earth and the sun

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