_________ is a natural electrical phenomenon characterized by the appearance of streamers of reddish or greenish light in the sky, especially near the northern or southern magnetic pole.
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A level of atmosphere which is composed partly of electrons and positive ions is called
In April 2017, the G20 Digital Ministerial Meeting on Digital Economy was held in which country?
Which of the following is a string based Indian musical instrument?
The 2016 Olympics was held in which city?
Through which does light travel best?
The founder of Bachpan Bachao Andolan (Save Child Movement ) is
_________ software are freely available and can be edited and customized by anyone.
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