When does solar eclipse take place ?
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__________ acts as a shield absorbing ultraviolet radiation from the sun.
What is the source of natural energy of the hot springs at Manikaran in Himachal Pradesh ?
Which of the following is not a commercial source of energy?
Chlorophyll was first isolated and named by
Fausa Magna is a ___________
Mars is the _______ planet from the Sun.
Which is the highest quality of hard coal?