Environmental Science
The aurora is produced by:

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
Reflections of sunlight by polar ice fields
Burning oxygen caused by the intense sunlight at high altitude

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Environmental Science
The order of basic processes involved in succession is

Invasion->stabilization-> competition and co action->Reaction>nudation
Nudation->stabilization-> competition and co action->Invasion>reaction
Nudation->Invasion-> competition and co action->reaction>stabilization
Invasion-> Nudation->competition and co action->Reaction>stabilization

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