Environmental Science
What is desertification?

Conversion of forests into desert
Conversion of grassland into desert
Conversion of croplands into desert
All of these

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Environmental Science
The aurora is produced by:

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

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