Environmental Science
The aurora is produced by:

Scattering of sunlight in the upper atmosphere
The combination of molecular and atomic oxygen to form ozone
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

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Environmental Science
What is meant by ex-situ conservation?

Conservation of a species by protecting its habitat along with all other species living there
Conservation of a species outside its natural habitat
Conservation of plants
Conservation of forest eco system

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