Environmental Science
What is an Incinerator?

None of these
Furnace used for burning solid waste
Both a & b
Furnace used for treating liquid waste

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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
The combination of molecular and atomic oxygen to form ozone
Fast-moving charged particles colliding with air molecules
Reflections of sunlight by polar ice fields

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