Environmental Science
The aurora is produced by:

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

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Environmental Science
What is meant by ex-situ conservation?

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

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