_________ 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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Spring tides occur when ______.
What is special about a sword-billed hummingbird?
Who Invented Ceiling fan?
When is International day for Preservation of Ozone layer observed?
ABC is a triangle if sin (A+B2)=32 then the value of Sin c2 is
If y=2-x1+x, then what is the value of 1y+1 + 2y+1y2-1 ?
Gobind Singh, the 10th Guru of Sikhs, was the son of whose?