Friction is caused by the ______________ on the two surfaces in contact.
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_________ 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.
Which of the following are the smaller planets than the size of the Earth?
Which of the following sources has the largest share in power generation in India?
The place on the earth's surface above the focus is called the __________.
Which of the following is the uppermost layer of the atmosphere?
Aung San Suu Kyi is the
Project 'Sankalp' started for the purpose____________