Environmental Science
The aurora is produced by:

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

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Environmental Science
What is the cause of the Exxon Valdez?

Oil Tanker which sank in 1989 along the coast of Alaska and marine life seriously affected.
none of these.
a plane which crashed and caused death of human life
a ship which wrecked on the coast of India

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